Oooh. i Like this subject.
Most Physicists are of themind these days that the universe is Accellerating as it expands. Rather than losing momentum, it is, in fact, gaining it. This means it would never implode, just continue moving out and out. This appears to contradict much of what Einstein believed. It also couples with the "unaccounted for" matter in the universe (some ridiculous amount like 50% of the universe's matter cant be accounted for), hence the theory of "dark matter". And so the X-Files had a weekly plot, and even had an episode with Tony Shalub.
You are correct in saying that the sun would envelope the earth, but from what i have seen, many scientists are on the fence about whether or not mars would be touched. Even if it wasnt, it would be close enough to it to be in the same state mercury is in right now.
Oh, and I have the answer to the chicken/egg controversy. It all depends on your belief:
Science:
Evolution says the egg. The bird that wasnt quite a chicken, just before the first true chicken was born, layed the first true chicken egg.
Creationism. God Made chicken, chicken laid the egg, chicken came first. Women like apples. Men will do anything for a naked woman (this holds true in a scientific belief system as well)
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