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Originally posted by Exodus17 When you look at a distant star or planet, you are looking back in time, according to the whole speed of light theory thing, it takes light a longass time to travel through space even at it's uber speeds... so the light emitted from a lit up star or planet takes forever to reach your eye - my friend then asks: imagine if you were on a faraway planet and you had like super telescopes and you were looking at earth... because of the whole light/time thing you would be looking back into earths past while in reality, here on earth we'd actually be years and years ahead of what you see from the distant planet.... so his question was.... if we were on a distant planet right now, do you think we'd be able to look at earth and see WWII, or maybe even farther back into the days of the Roman Empire, or the Egyptians... or even see the dinosaurs?.

It naturally depends on how far the star/planet is. In order to see WWII, the planet would need to be 62 light-years away (is this the proper name?). In order to see the dinassaurs, it would have to be far, far, more than far away.

(You'd need an incredibly precise telescope to see a simple house, for that matter).

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Originally posted by BeatFreak That first one is pretty cool. But what about this one? You know how people say they see UFO's and little aliens with big heads and eyes and small bodies? What if those aren't UFO's but they are actually humans from the way distant future who have evolved into that traveling back in time to see us? Huh? huh? well? That'd be crazy.

F

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quote:

Originally posted by Halcyon+On+On OOKA-OOKA ME NACHOS ME PRESS KEYS ON COMPUTER GOOD

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Originally posted by Halcyon+On+On more relative towards the specific inertial reference frame *snip* (therefore destroying this planet)

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haha, i didn't really think I knew too much about physics and stuff, but from reading these replies, I think I do. of course if you were hypothetically on a place that is light years away and you had a hypothetical devise to view the earth, you would see the past. that is only because we define time through relative experiences.


if you wanna know another 'mind blower' (this one shut a stoner up one night so I could sleep, he kept trying to talk..judas)....when you look at stars, that is not really where they are. As the light from each star travels through space it is pulled and pushed by the gravity of stars it is passing by. so it refracts the light making it appear in a different location.




and ther is no sound in teh space...z0mgz0rz

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Originally posted by Halcyon+On+On However, this sort of chaotic randomness creates its problems for us. Though we believe that there are not any stars close enough to Earth that are in danger of going Supernova (therefore destroying this planet), there is always the danger of two black holes merging. Because of the nature of these things, and the relatively low budget NASA gets (some people would rather spend money in Iraq ) We can't look at everything we would like to. This arises the possibility of two black holes merging, which, although it creates a wormhole (theoretically), it also emits what is called a Gamma Ray Burst. That would kill every living thing on Earth in under 12 seconds if it hit us at all. Just goes to show - we're not shit.

Sorry for being sceptical to that, but

a) gamma ray bursts are quite common. Although a single burst is extremly powerful we won't notice much due to the distances involved (a huge burst measured on 27. december emited more energy than the sun does in 150'000 years, see here ). And where do those 12 seconds come from

b) AFAIK it's not quite incommon for black holes to collide (at least if you move towards the center of the galaxy). On the other hand, I'm quite sure that, what people think are stars "colliding" with black holes, have been observed.

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