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Would an ETV be able to visit Earth secretly?


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Just now, freetoroam said:

 

Do you know years ago i used to hear the word snot quite a bit....now i hardly hear it being used.

Hmm..maybe the virus has mutated.  

Hold up. What if the aliens are just an idea and we've had them in our brains forever? They propagate from mind to mind, slowly taking over and selecting a special few to make movies and write stories. Holy Hell, the aliens have us all under mind control. The memetic virus has won or has it?

 

 

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40 minutes ago, Fila said:

The reasons why an ET race would remain secret also deserves a thread of its own.

No, trust me, it does not. it can still fit in here nicely.

Have you got OPD? Every idea relating to a thread does not need its very own thread. 

 

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5 minutes ago, XenoFish said:

Hold up. What if the aliens are just an idea and we've had them in our brains forever? They propagate from mind to mind, slowly taking over and selecting a special few to make movies and write stories. Holy Hell, the aliens have us all under mind control. The memetic virus has won or has it?

 

 

tenor.gif?itemid=9523530

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Ok, I know the concept of ET paying us a visit is a fan favorite of the media. The movies and pop culture are full of bug eyed grey aliens, flying saucers and guys named 'Bubba' who claim to have been probed. We get it, there's a great deal of nonsense regarding ET visitation.

That said, it still remains that the universe is chock full of other solar systems, with planets orbiting these alien suns....and it's highly probable that life has evolved someplace other than our Earth. It's not outside of the realm of possibility that some of this life could be intelligent and much older (having had far more time to evolve) than us humans. All jokes aside, we may very well find ourselves at any point in time having to deal with 'first contact'. IMO if or when this happens I seriously doubt that any of us are going to be joking about the matter.

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5 hours ago, freetoroam said:

What is it with this plasma stealth technology?  Unless an alien race have been watching our planet from all the millions of mile away, they would not know what technology we have here. 

Also...getting back to the topic of this thread, they may have the technology to be undetected by our radars but they still have to get through our atmosphere. 

There is more to getting to Earth and not being detected by all the sky watchers or radars...any alien race which could be out there and intelligent and advanced enough to travel through the Universe still have to get to us safely and if they are advanced enough to do that...as i said earlier, they would very likely be advanced enough to watch our planet well before getting here and if weary about us, would likely have the technology to send something to us to make contact prior to landing here.

Let me just make this point very clear: i truly believe we are not alone and there is life on other planets...but as to us being visited...i do not believe we have been....maybe one day aliens will arrive here or maybe one day.....we....will arrive there, where ever there may be....or maybe it will never happen.

Finding life on another planet for us does not need a man in a spaceship...so it is possible an alien inhabitated craft is not on its way to us, but an alien un(manned) craft and it relays back images of what it discovers on its way...(like Cassini did for us) then being detected would not be an issue. 

 

 

My point has always been that we are so focussed on main stream images of spacecraft and aliens that we are looking for  specific kind of extra terrestrial life, our open mindedness is (somewhat) limited, we expect it to look a certain way.

Also, we have no idea what extra terrestrial contact would look like, my argument has always been that they could already be here...we just 'grew' up with them...hence they are not alien...they are part of our everyday life...

Then again...i don't believe in aliens...in the mainstream kinda way...the spacecraft kinda guys. Life somewhere out there? Probably

 

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3 hours ago, Lilly said:

Ok, I know the concept of ET paying us a visit is a fan favorite of the media. The movies and pop culture are full of bug eyed grey aliens, flying saucers and guys named 'Bubba' who claim to have been probed. We get it, there's a great deal of nonsense regarding ET visitation.

That said, it still remains that the universe is chock full of other solar systems, with planets orbiting these alien suns....and it's highly probable that life has evolved someplace other than our Earth. It's not outside of the realm of possibility that some of this life could be intelligent and much older (having had far more time to evolve) than us humans. All jokes aside, we may very well find ourselves at any point in time having to deal with 'first contact'. IMO if or when this happens I seriously doubt that any of us are going to be joking about the matter.

Unless they are friendly...we might joke in relief...

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18 hours ago, XenoFish said:

It would crash into earth and start harvesting resources. Organic material to feed it's crew and natural resources to rebuild/power itself before cracking the earth.

No...why would that be the first thing they do? Why do we assume they need us in some way?

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5 hours ago, freetoroam said:

Every idea relating to a thread does not need its very own thread. 

And that, imo, is demonstrated by this thread.  Of course we don't monitor perfectly.  And never will.  And of course there will always be better technology..

Aren't the more important questions:

  • do aliens exist close enough to visit?
  • do they have the tech and desire to visit?
  • how would they know we are here?
  • and finally, after all that ... why the hell would they hide?

 

PS - Each night at about 7:30pm, an unlit chopper flies nearly overhead.  I don't know what it is or where it got permission to not use proper strobes or any lighting whatsoever, but it is essentially invisible unless it blocks a star or the moon briefly.  Problem is, it does not have stealth tech for the blades, and it makes a huge racket.... (but I've seen Blue Thunder, so I know they can if they want to......) :D

So yes is the answer to the thread title.  But I don't think it is a terribly useful question, I'm sorry.

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another issue with sightings is... we KNOW space around earth is full of junk, bits of rockets dead satellites, broken and smashed to smithereens satellites

heres a graphic

4-8-nrc-evaluates-nasas-orbital-debris-p

https://www.nasa.gov/mission_pages/station/news/orbital_debris.html

 

So isnt it also reasonable to assume....that with ALL that junk above our atmosphere, that some will be sighted and mistaken for UFO's?  YES...of course! 
 

Now that space debris is also TRACKED

 

Quote

 

 

There are more than 20,000 pieces of debris larger than a softball orbiting the Earth. They travel at speeds up to 17,500 mph, fast enough for a relatively small piece of orbital debris to damage a satellite or a spacecraft. There are 500,000 pieces of debris the size of a marble or larger. There are many millions of pieces of debris that are so small they can’t be tracked.

https://www.nasa.gov/mission_pages/station/news/orbital_debris.html


 

 

if THAT junk can be tracked... dont you think something passing thru that junk to get to earth, will also be tracked/spotted?  And as the article states, that junk and its velocity can cause to damage to space craft..... so those visiting aliens need to also know that.... to get thru it safely...

 

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 There is also this idea about " an ETV",  would it not be posible that if an alien race were to have the technology to travel the Universe for millions of miles, that they would not risk the run alone? How about they travelled in fleets? 

And there could well be more than one other planet out there with life on it...so we also have to hope that we are even on their list to be visited..

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On 01/01/2018 at 10:33 PM, seeder said:

next we have all manner of satellites that observe earth and space...there are many that circle the earth 24/7....365 days a year....incl the Space Station, and the satellites are also tracked from earth...this is just one reason of course even the weather programs show us satellite maps of the weather over our countries.. Then, all of the 'stronger' more wealthier countries with a strong military, naturally observe and monitor their own air spaces due to the possibility of surprise attacks, enemy aircraft etc.. So.... in one sense...Every country with a commercial airport monitors the skies and flight paths of its planes too,

Thanks Seeder. It does makes sense that we would be able to see anything. I just wondered why we cannot not find flight MH-370?

97de3cf51dea6d951e8ab6fa143b72dd--solomo

Planes are usually tracked by; 

- ADS-B is less common with only 35% of planes equipped in the US.

- MLAT, 99% of Europe is covered, only parts of the US are. At least four receivers are needed to calculate the position of an aircraft

- TAR (primary) radar relies on radio waves reflecting off metallic objects and is effective within a short range from the radar head 160 nmiles away

- En route radar, or secondary surveillance radar, relies on an aircraft having a transponder which transmits a data signal. The signal is received and interrogated by a ground station ranging from 250 nmiles (463 km) in radius and up to 100 000 ft (30 km). Not very much at all.

The ease with which Malaysia Airlines flight MH370 disappeared from radar systems illustrates how modern aviation relies on ageing ground infrastructure. The inability of 26 nations to find a 250-tonne Boeing 777 has shocked an increasingly connected world and exposed flaws in the use of radar, which fades over oceans and deserts. 

We track our cars, we track our kids' cell phones, but we can't track airplanes when they are over oceans or other remote areas. Satellites provide the obvious answer, experts say. However the overhaul of current systems would be costly

All planes have a radar transponder that squawks their identity and location via terrestrial radio signals. But once they pass out of range of land-based radar, a few hundred kilometres from the shore, aircraft are often on their own until they’re picked up by the next receiver.

Planes are big, but the ocean is much bigger and searching can be difficult. It took two years to find the wreckage of an Air France airliner that went down in the mid-Atlantic in 2009. And it’s not just planes that disappear into the abyss. On 4 February 2013, a 1400-tonne ocean liner, the Lyubov Orlova, went missing and has never been found.

Satellites 

spy-satellite.jpg?w=240

Weather satellites take low-resolution pictures of the entire planet each day, but the high-resolution images needed to search for a plane are less frequent. There are only around 10 US, Russian and European satellites capable of such detailed images. They each orbit Earth roughly every hour and a half, imaging a strip a few hundred kilometres wide as they go. “Each one probably covers a few per cent of the Earth every day. 

Factoring in things like maintenance, cloud cover and the fact that they don’t take images all the time, that probably means at most 5 per cent of the planet is imaged in high-resolution each day. Some areas, such as cities, are imaged much more than others. "Open ocean is not what you’re taking pictures of" Jonathan McDowell of the Harvard-Smithsonian Center For Astrophysics in Cambridge, Massachusetts.

What about Spy satellites?
The US National Reconnaissance Office (NRO) has an extensive network of spy satellites that cover the globe and could have taken an image of the downed plane. We don’t know the exact capabilities of these satellites, but they are likely to take sharper pictures than the civilian equivalent, They are also probably equipped with more advanced colour filters and the NRO is likely to have advanced image analysis software, both of which could help pick out wreckage from the sea.
 

So could the NRO have a picture of the plane?
It is not the NRO’s job to track commercial airliners. The satellites’ orbits are public knowledge and some have passed close to the plane’s last known location, but they may not have been imaging at the time. If the agency does have a picture, it would probably quietly pass that information to the relevant authorities, says McDowell.

Many satellites don’t take pictures in visible light, but use other wavelengths instead. The NRO’s infrared satellites look for the heat signatures of missile launches around the world, and could potentially see a plane exploded in mid air. According to The New York Times, the US Department of Defense has checked the surveillance data and found no evidence of an explosion.

"Using a system that looks for flashes around the world, the Pentagon reviewed preliminary surveillance data from the area where the plane disappeared and saw no evidence of an explosion,"

240_F_161210734_J3nKg72ic836oZORtOJhhgUU

 

http://www.abc.net.au/news/2014-03-22/malaysia-jet-saga-highlights-radar-deficiencies/5338720https://www.newscientist.com/article/dn25221-did-us-spy-satellites-track-malaysia-flight-mh370/https://www.nytimes.com/2014/03/09/world/asia/malaysia-airlines-flight.html?_r=0http://www.airservicesaustralia.com/services/how-air-traffic-control-works/our-technology/https://www.flightradar24.com/about

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4 hours ago, DebDandelion said:

No...why would that be the first thing they do? Why do we assume they need us in some way?

They wouldn't. That's why we're dinner. lol

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1 hour ago, Fila said:

Thanks Seeder. It does makes sense that we would be able to see anything. I just wondered why we cannot not find flight MH-370?

97de3cf51dea6d951e8ab6fa143b72dd--solomo

Planes are usually tracked by; 

- ADS-B is less common with only 35% of planes equipped in the US.

- MLAT, 99% of Europe is covered, only parts of the US are. At least four receivers are needed to calculate the position of an aircraft

- TAR (primary) radar relies on radio waves reflecting off metallic objects and is effective within a short range from the radar head 160 nmiles away

- En route radar, or secondary surveillance radar, relies on an aircraft having a transponder which transmits a data signal. The signal is received and interrogated by a ground station ranging from 250 nmiles (463 km) in radius and up to 100 000 ft (30 km). Not very much at all.

The ease with which Malaysia Airlines flight MH370 disappeared from radar systems illustrates how modern aviation relies on ageing ground infrastructure. The inability of 26 nations to find a 250-tonne Boeing 777 has shocked an increasingly connected world and exposed flaws in the use of radar, which fades over oceans and deserts. 

We track our cars, we track our kids' cell phones, but we can't track airplanes when they are over oceans or other remote areas. Satellites provide the obvious answer, experts say. However the overhaul of current systems would be costly

All planes have a radar transponder that squawks their identity and location via terrestrial radio signals. But once they pass out of range of land-based radar, a few hundred kilometres from the shore, aircraft are often on their own until they’re picked up by the next receiver.

Planes are big, but the ocean is much bigger and searching can be difficult. It took two years to find the wreckage of an Air France airliner that went down in the mid-Atlantic in 2009. And it’s not just planes that disappear into the abyss. On 4 February 2013, a 1400-tonne ocean liner, the Lyubov Orlova, went missing and has never been found.

Satellites 

spy-satellite.jpg?w=240

Weather satellites take low-resolution pictures of the entire planet each day, but the high-resolution images needed to search for a plane are less frequent. There are only around 10 US, Russian and European satellites capable of such detailed images. They each orbit Earth roughly every hour and a half, imaging a strip a few hundred kilometres wide as they go. “Each one probably covers a few per cent of the Earth every day. 

Factoring in things like maintenance, cloud cover and the fact that they don’t take images all the time, that probably means at most 5 per cent of the planet is imaged in high-resolution each day. Some areas, such as cities, are imaged much more than others. "Open ocean is not what you’re taking pictures of" Jonathan McDowell of the Harvard-Smithsonian Center For Astrophysics in Cambridge, Massachusetts.

What about Spy satellites?
The US National Reconnaissance Office (NRO) has an extensive network of spy satellites that cover the globe and could have taken an image of the downed plane. We don’t know the exact capabilities of these satellites, but they are likely to take sharper pictures than the civilian equivalent, They are also probably equipped with more advanced colour filters and the NRO is likely to have advanced image analysis software, both of which could help pick out wreckage from the sea.
 

So could the NRO have a picture of the plane?
It is not the NRO’s job to track commercial airliners. The satellites’ orbits are public knowledge and some have passed close to the plane’s last known location, but they may not have been imaging at the time. If the agency does have a picture, it would probably quietly pass that information to the relevant authorities, says McDowell.

Many satellites don’t take pictures in visible light, but use other wavelengths instead. The NRO’s infrared satellites look for the heat signatures of missile launches around the world, and could potentially see a plane exploded in mid air. According to The New York Times, the US Department of Defense has checked the surveillance data and found no evidence of an explosion.

"Using a system that looks for flashes around the world, the Pentagon reviewed preliminary surveillance data from the area where the plane disappeared and saw no evidence of an explosion,"

240_F_161210734_J3nKg72ic836oZORtOJhhgUU

 

http://www.abc.net.au/news/2014-03-22/malaysia-jet-saga-highlights-radar-deficiencies/5338720https://www.newscientist.com/article/dn25221-did-us-spy-satellites-track-malaysia-flight-mh370/https://www.nytimes.com/2014/03/09/world/asia/malaysia-airlines-flight.html?_r=0http://www.airservicesaustralia.com/services/how-air-traffic-control-works/our-technology/https://www.flightradar24.com/about

 

Do read all the article

http://www.bbc.co.uk/news/magazine-26671224

 

 

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1 hour ago, Fila said:

On 4 February 2013, a 1400-tonne ocean liner, the Lyubov Orlova, went missing and has never been found

It was a derelict ship....there are hundreds out there in the oceans...left to rot. 

You can not compare planes and ships which are tracked, but then lose contact when they hit the seas or a bad storm with alien crafts travelling millions miles across the Universe. 

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19 minutes ago, XenoFish said:

They wouldn't. That's why we're dinner. lol

Hmm and if we were their dinner, what kind of dinner would we be?

I think i would be a sweet desert with strawberries dotted around the sides with a few hundred and thousands sprinkled on top.

I think this could do with its own thread  HEY Fila, how about another thread?

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3 minutes ago, freetoroam said:

Hmm and if we were their dinner, what kind of dinner would we be?

I think i would be a sweet desert with strawberries dotted around the sides with a few hundred and thousands sprinkled on top.

I think this could do with its own thread  HEY Fila, how about another thread?

I'm thinking some kind of gumbo.

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Just now, XenoFish said:

I'm thinking some kind of gumbo.

Yeah..i can smell it just thinking about it. Yum yum.

But you got to be served on toast.

Then aliens are going to have a feast with us, unless they are vegetarians.

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Just now, freetoroam said:

Yeah..i can smell it just thinking about it. Yum yum.

But you got to be served on toast.

Then aliens are going to have a feast with us, unless they are vegetarians.

That's why I'm here for. I am a Xenofishian from Nibiru. On a mission to look for intelligent life. The dolphins are safe.

With roughly 110,000 calories. per human. I think we'll be well fed. Might leave a few of you around to breed. This is one of our favorite dining spot. To bad we made the dinosaurs extinct.

 

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On 02/01/2018 at 9:17 PM, seeder said:

Sorry. I was using MH-370 as an example of possibly why UFOs remain undetected. (UFOs ranging from Chinese to ETs)

On 02/01/2018 at 9:19 PM, freetoroam said:

You can not compare planes and ships which are tracked, but then lose contact when they hit the seas or a bad storm with alien crafts travelling millions miles across the Universe. 

I can in context to monitoring the Earth with satellites and radar being used to imply that UFOs or ETs cannot possible exist.

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4 minutes ago, Fila said:

 

I can in context to monitoring the Earth

 

 

The ETV's are not coming from Earth.  They are coming from millions of miles away and those monitoring the ships are not the same people monitoring the Universe.

We have planes which can not be detected....the reason is because the people who made them knew how to do it based on the radar systems man has invented. Aliens would not know what system we have invented here.

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On 02/01/2018 at 10:12 PM, freetoroam said:

The ETV's are not coming from Earth.  They are coming from millions of miles away and those monitoring the ships are not the same people monitoring the Universe.

We have planes which can not be detected....the reason is because the people who made them knew how to do it based on the radar systems man has invented. Aliens would not know what system we have invented here.

On 02/01/2018 at 9:44 AM, Fila said:
On 02/01/2018 at 10:11 AM, Fila said:

excerpts from page 2 below....

The fact that we can see asteroids in space.., does make it seem like we can detect everything all the time. I also used to assume this until I looked into how it all works. Observers find and track objects using NASA’s space-based NEOWISE infrared telescope and ground-based telescopes around the world which can;

1) Only be used at night time and on clear nights, not sunset or sunrise and is subjected to damage, faults and repairs. (This reduces time dramatically). This particular scope which captured the images below only recently came back online after several months due to instruments being damaged by hurricane Maria.  

Due to these Ground-based telescopes limitations.., based on statistical population estimates, about 74 percent of NEOs still remain to be discovered.., so there is no 24 hour, 365 monitoring of 100% of the sky. More like 25% of 40% coverage in that hemisphere in perfect conditions, zoomed in.

2) These observatories are not dedicated to scanning for asteroids. For example this one is operated by SRI International, USRA and UMET, under cooperative agreement with the National Science Foundation (NSF) Arecibo started with the dual purpose of understanding the ionosphere's F-layer while also producing a general-purpose scientific radio observatory. Scientists who want to use the observatory submit proposals that are evaluated by an independent scientific board.

Due to this small time frame of a shared observatory (huge list of scientists even military).., only single photos are taken, then compared with other single images collected over weeks and months. We cannot see a distant asteroid moving in real time because space is quite large and these objects move slow in comparison. 2 hours of observation in one night will not show much movement. The changes are subtle over time.

Its done by looking for slow changes., (Objects can fly around during that gap). Even though they are called "wide-field survey observatories".., they are very powerful telescopes that point towards different positions in the sky and track those positions for an extended time as Earth rotates. (Not monitoring the entire sky).

NASA's Planetary Defense Coordination Office is responsible for finding, tracking and characterising specifically "potentially hazardous" asteroids and comets coming near Earth. Not all. Near Earth refers to asteroids or comets within approximately 121 million miles and objects larger than about 460 feetThe 460-foot cutoff point was established by a NASA NEO survey science definition team (SDT) in 2003. Anything smaller is not deemed worthy.

3) These long range scopes (optical, radar, radio, infrared) are used to detect very large objects at a long distance. (Smaller craft, drones, debris or satellites are not detected). For an ET race to traverse space within a realistic time frame.., we assume it must travel faster than any asteroid (light speed or higher). Smaller and faster objects are too hard for long distance scopes to detect..  While zoomed in on distant objects.., it cannot monitor the skies with 100% coverage constantly with LIVE video feed as we tend to assume.

4) Radar is then used to get the clearest images. This is not perfect, for example. The black area of the asteroid is most likely a depression that did not reflect the radar beam back to Earth These single images are the best we could get of such a large object (3.6mi) 6.4 million miles away during the 15th to the 19th of December 2017. 

PIA22185-16.jpg

A spaceship is a tiny fraction of the 6 kilometre giant in size would not even show up on these images. In fact.., there could be smaller objects in these images right now.., but we cannot tell. (Approx 250 ft per pixel) 

5) People have a romanticised view of astronomers, sitting with a group of nice people sipping coffee and staring through scopes.., but they are mostly run and monitored by computers. Most professional astronomers rely on database queries instead.

Amateur astronomers use powerful optical telescopes to view light. Can only be used at night time, without cloud cover. Light pollution from cities and full moon make visibility poor.

In order to see a satellite beyond the moon (for example)., would require the sun's light to reflect off the metal.., back to the telescope. The small amount of light (when at the right angle) would not be enough to see after a certain distance (something I am looking into now).

Until I find the statistics on telescope types (refracter/reflector), focal length / aperture / distance and light..., have a look through any optical scope these amateur astronomers have.., and look at something like Europa and tell me how big it is. Then compare this to a potential ETV the size of a car, house, or skyscraper..

Or even look at the moon... Consider trying to track an (alleged) fast ETV through an optical scope designed for stationary objects (set tripod, motorised tracking, equatorial pans) and various distances with objects (car, house etc)

Edited by Fila
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Remember this:

Quote

But the fact that we now know the answer lies in space is a big deal. It might sound obvious, but let's not forget that back in 1998, researchers thought they had discovered a new type of radio signal coming from space, only to figure out 17 years later that it was coming from a microwave oven in their research facility.

But there are signals out there...so it is posible for us to pick them up. 

But take a look at how far they are:

Quote

Eventually, they uncovered three new FRB signals in the telescope's data, which matched perfect with the signals we've picked up before - indicating that they couldn't possibly be coming from Earth.

Their conclusions back up findings from earlier this year, when researchers were able to pinpoint the source of a FRB to a tiny dwarf galaxy more than 3 billion light-years from Earth.

 

Thats a long way for any ETV to travel before it gets to us, IF the signals are from aliens, then they have been picked up and are being monitored and are not hiding...especially over that amount of distance. As yet we do not know,  but is very interesting to follow this. 

Quote

The Molonglo telescope is now being updated with the hope that it might be able to provide some more insight in future - hopefully even going as far as pinpointing specific galactic origins

Here is the link...but there are many more:

https://www.sciencealert.com/confirmed-mysterious-radio-bursts-detected-by-astronomers-really-are-coming-from-outer-space

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25 minutes ago, Fila said:

The fact that we can see asteroids in space.., does make it seem like we can detect everything all the time. I also used to assume this until I looked into how it all works. Observers find and track objects using NASA’s space-based NEOWISE infrared telescope and ground-based telescopes around the world which can;

1) Only be used at night time and on clear nights, not sunset or sunrise and is subjected to damage, faults and repairs. (This reduces time dramatically). This particular scope which captured the images below only recently came back online after several months due to instruments being damaged by hurricane Maria.  

Due to these Ground-based telescopes limitations.., based on statistical population estimates, about 74 percent of NEOs still remain to be discovered.., so there is no 24 hour, 365 monitoring of 100% of the sky. More like 25% of 40% coverage in that hemisphere in perfect conditions, zoomed in.

2) These observatories are not dedicated to scanning for asteroids. For example this one is operated by SRI International, USRA and UMET, under cooperative agreement with the National Science Foundation (NSF) Arecibo started with the dual purpose of understanding the ionosphere's F-layer while also producing a general-purpose scientific radio observatory. Scientists who want to use the observatory submit proposals that are evaluated by an independent scientific board.

Due to this small time frame of a shared observatory (huge list of scientists even military).., only single photos are taken, then compared with other single images collected over weeks and months. We cannot see a distant asteroid moving in real time because space is quite large and these objects move slow in comparison. 2 hours of observation in one night will not show much movement. The changes are subtle over time.

Its done by looking for slow changes., (Objects can fly around during that gap). Even though they are called "wide-field survey observatories".., they are very powerful telescopes that point towards different positions in the sky and track those positions for an extended time as Earth rotates. (Not monitoring the entire sky).

NASA's Planetary Defense Coordination Office is responsible for finding, tracking and characterising specifically "potentially hazardous" asteroids and comets coming near Earth. Not all. Near Earth refers to asteroids or comets within approximately 121 million miles and objects larger than about 460 feetThe 460-foot cutoff point was established by a NASA NEO survey science definition team (SDT) in 2003. Anything smaller is not deemed worthy.

3) These long range scopes (optical, radar, radio, infrared) are used to detect very large objects at a long distance. (Smaller craft, drones, debris or satellites are not detected). For an ET race to traverse space within a realistic time frame.., we assume it must travel faster than any asteroid (light speed or higher). Smaller and faster objects are too hard for long distance scopes to detect..  While zoomed in on distant objects.., it cannot monitor the skies with 100% coverage constantly with LIVE video feed as we tend to assume.

4) Radar is then used to get the clearest images. This is not perfect, for example. The black area of the asteroid is most likely a depression that did not reflect the radar beam back to Earth These single images are the best we could get of such a large object (3.6mi) 6.4 million miles away during the 15th to the 19th of December 2017. 

PIA22185-16.jpg

A spaceship is a tiny fraction of the 6 kilometre giant in size would not even show up on these images. In fact.., there could be smaller objects in these images right now.., but we cannot tell. (Approx 250 ft per pixel) 

5) People have a romanticised view of astronomers, sitting with a group of nice people sipping coffee and staring through scopes.., but they are mostly run and monitored by computers. Most professional astronomers rely on database queries instead.

Amateur astronomers use powerful optical telescopes to view light.

In order to see a satellite beyond the moon (for example)., would require the sun's light to reflect off the metal.., back to the telescope. The small amount of light (when at the right angle) would not be enough to see after a certain distance (something I am looking into now).

Until I find the statistics on telescope types (refracter/reflector), focal length / aperture / distance and light..., have a look through any optical scope these amateur astronomers have.., and look at something like Europa and tell me how big it is. Then compare this to a potential ETV the size of a car, house, or skyscraper..

Or even look at the moon... Consider trying to track an (alleged) fast ETV through an optical scope designed for stationary objects (set tripod, motorised tracking, equatorial pans) and various distances with objects (car, house etc)

Please see my above post. You do not need an opticle telescope to pick up things is space. 

Quote

A radio telescope is a specialized antenna and radio receiver used to receive radio waves from astronomical radio sources in the sky in radio astronomy.[1][2][3] Radio telescopes are the main observing instrument used in radio astronomy, which studies the radio frequency portion of the electromagnetic spectrum emitted by astronomical objects, just as optical telescopes are the main observing instrument used in traditional optical astronomy which studies the light wave portion of the spectrum coming from astronomical objects. 

https://en.m.wikipedia.org/wiki/Radio_telescope

 

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The signals are being picked up by radio telescopes.

When i say the skies are being watched, this includes all means, not just with a human eye.

 

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