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Earth struck by big asteroids 'all the time'


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#16    Frank Merton

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Posted 21 April 2014 - 11:01 AM

Space is big, even in the solar system it is almost all empty; it is not like billiards; these collisions happen very rarely.


#17    cyclopes500

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Posted 21 April 2014 - 01:47 PM

Asteroids don't bother me. Its comets I'm more worried about. Not only are they unpredictable, they moving a hell of a lot faster and can hit asteroids as well as the arth. Nobody expected Hale Bopp for example. Copied from Wikipedia. The estimated probability of impacting Earth in future passages through the inner Solar System is remote, about 2.5 x 10−9 per orbit.[33] However, given that the comet nucleus is around 60 km in diameter,[1] the consequences of such an impact would be apocalyptic. A calculation given by Weissman[33] conservatively estimates the diameter at 35 km; an estimated density of 0.6 g/cm3 then gives a cometary mass of 1.3 x 1019 g. An impact velocity of 52.5 km/s yields an impact energy of 1.9 x 1032 ergs, or 4.4 x 109 megatons, about 44 times the estimated energy of the K-T impact event. End of Wikipedia. End of Planet Earth even if it misses us and hits the moon.


#18    The Black Ghost

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Posted 21 April 2014 - 05:33 PM

I would say that since most of what they are classifying as "asteroids" explode in the atmosphere, the risk of damage to us on the ground is minimal.


#19    Calibeliever

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Posted 21 April 2014 - 06:21 PM

I had no idea they were that frequent. Even if most of these explosions are occuring high in the atmosphere it's still pretty astonishing that there are explosions a couple of times a year of that size and people don't see more of them. I guess the odds are in our favor because of the fact that people only inhabit a small fraction of the planet but still...


#20    David Thomson

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Posted 22 April 2014 - 12:39 AM

Asteroids of this size were not frequent until the solar system entered an Interstellar dust cloud in 2002. NASA seems to be hiding this fact for some reason. Instead of telling it as it is, they are inventing history by saying this has been happening all along but we haven't noticed. If these kinds of events have been happening all along, they would have been noticed a long time ago. We have been monitoring gamma ray bursts, have satellites in space monitoring the atmosphere, had space stations observing Earth, and have airplanes all over the planet in the air all the time. And now they only have data for impacts since 2001? They are pulling the wool over our eyes to hide the truth from everyone. Large asteroids in large quantities are here to stay for a few hundred years.


#21    taniwha

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Posted 23 April 2014 - 08:50 AM

You can watch the visualisation now here...

https://b612foundation.org

Maybe future Sentinels might even destroy or repel the most dangerous asteroids.


#22    toast

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Posted 23 April 2014 - 11:06 AM

View PostDavid Thomson, on 22 April 2014 - 12:39 AM, said:

Asteroids of this size were not frequent until the solar system entered an Interstellar dust cloud in 2002.
NASA seems to be hiding this fact for some reason.
Are you talking about the LIC (Lokal Interstellar Cloud) here? If not, can you pls provide a reliable source
that will back your claim? No NewAge/shaman/hippie sources please.

Edited by toast, 23 April 2014 - 11:13 AM.

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#23    Calibeliever

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Posted 23 April 2014 - 04:36 PM

View PostDavid Thomson, on 22 April 2014 - 12:39 AM, said:

Asteroids of this size were not frequent until the solar system entered an Interstellar dust cloud in 2002. NASA seems to be hiding this fact for some reason. Instead of telling it as it is, they are inventing history by saying this has been happening all along but we haven't noticed. If these kinds of events have been happening all along, they would have been noticed a long time ago. We have been monitoring gamma ray bursts, have satellites in space monitoring the atmosphere, had space stations observing Earth, and have airplanes all over the planet in the air all the time. And now they only have data for impacts since 2001? They are pulling the wool over our eyes to hide the truth from everyone. Large asteroids in large quantities are here to stay for a few hundred years.
I'm no expert but I try to stay current on astronomy. This is the first I've heard about an increase in asteroids. I would think NASA would be shouting this as loud as they could to get funding to beef up their observation programs. I would also like to see some sources for this revelation please.





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