Invisible star 'shooting comets at Earth'

the sun emits light it is a yellow mainstream star. a brown dwarf does not shine it is too small to shine. it supposedly gives off more energy than jupiter, which when they first came up with the idea of a brown dwarf thought that jupiter might be one. anyways a brown dwarf mass is far greater than that of jupiter but not high enough to start nuclear fusion. thus the only way we can see one is through reflected light. although we may see it through gravity lenseing effect, but that would only show the star behind it not the star itself, like a black hole. too use your light bulb example. if yo... [More]

Would a brown dwarf have a reflective surface? The albedo would have to be fairly high? When still young, up to a billion years old, brown dwarfs can have temperatures and luminosities similar to some stars. the luminositie of the earth was greater at it's birth than the noon day sun is. ie at that time you couldnt see the sun from the surface of the earth. as for the albedo that would depend on what it's outer cloud layer is made of.

it supposedly gives off more energy than jupiter, which when they first came up with the idea of a brown dwarf thought that jupiter might be one. anyways a brown dwarf mass is far greater than that of jupiter but not high enough to start nuclear fusion. thus the only way we can see one is through reflected light. If it gives off more energy than it recieves it is emitting light. Not necessarily visible light, but that is the whole point of the infra-red sky mapping that the original post mentioned. Every object with a finite temperature is emitting light. although we may see it through gravity... [More]

If it gives off more energy than it recieves it is emitting light. Not necessarily visible light, but that is the whole point of the infra-red sky mapping that the original post mentioned. Every object with a finite temperature is emitting light. How does that sentence make any sense? The gravitational lensing of a brown dwarf would be miniscule, and certainly not enough to show anything behind the brown dwarf. Yes, if an object is rather reflective you can see light reflected off it. I'm glad we figured that out. It is still rather doubtful that enough light from the Sun will reflect of a bro... [More]

the luminositie of the earth was greater at it's birth than the noon day sun is. ie at that time you couldnt see the sun from the surface of the earth. as for the albedo that would depend on what it's outer cloud layer is made of. I have heard early earth was probably purple. Yes, if an object is rather reflective you can see light reflected off it. I'm glad we figured that out. It is still rather doubtful that enough light from the Sun will reflect of a brown dwarf in the Oort cloud for us to see it. That's what I thought.

if a brown dwarf or any large body outside of the oort cloud was in orbit around the sun, and it stayed outside of the oort cloud then it may once in a while send a comet into the solar system. how ever if said body actually dropped inside the oort cloud, which i think we will find spherecal in shape rather than flat like the planets are, then the odds of it sending a comet or two greatly increase.

if a brown dwarf or any large body outside of the oort cloud was in orbit around the sun, and it stayed outside of the oort cloud then it may once in a while send a comet into the solar system. how ever if said body actually dropped inside the oort cloud, which i think we will find spherecal in shape rather than flat like the planets are, then the odds of it sending a comet or two greatly increase. Those that get past the gravity of Saturn and Jupiter. Anyone old enough to remeber this one on the news?

Those that get past the gravity of Saturn and Jupiter. Anyone old enough to remeber this one on the news? sorry, i wasnt talking about them hitting the earth, and yes i remember shoe maker. they also have to get by the moon. i think it was in the 1800's when the moon got hit so badly we could see it rocking.

sorry, i wasnt talking about them hitting the earth, and yes i remember shoe maker. they also have to get by the moon. i think it was in the 1800's when the moon got hit so badly we could see it rocking. Shoemaker was very awesome to witness. We would draw more likely shield the moon in such an instance due to size and gravity wouldn't we? Can you further some information on the moon being rocked, I am at a complete loss there.

Shoemaker was very awesome to witness. We would draw more likely shield the moon in such an instance due to size and gravity wouldn't we? Can you further some information on the moon being rocked, I am at a complete loss there. sorry they just want to link me to moon rocks. and i may have the wrong century. but it was supposed to be seen without a telescope.