Quote:
Originally Posted by Matt  Astronomy is said to be a humbling profession. The universe is estimated to be 13.7 billion years old and 156 billion light years wide. |
That means that the light from most of that 156 billion light years wide universe didn't even came here...amazing. And some scientists say that opposite side of universe continues to expand away from us by faster than light speed, so it won't ever arrive!
I'm interested, if it is possible to go straight on away from our planet and (after few aeons pass, of course
) to arrive back from opposite direction. Maybe law of relativity kicks in and you'd arrive before departure?
Another interesting consideration it that whether matter density in universe stays constant - whether new matter is continually created to offset the expansion. Scientists say that all matter in universe was created from the vacuum so, that the vacuum discharged into matter in steps during early stages of universe. And apparently vacuum still has hidden energy, in fact scientists still doesn't know what makes for 9/10 of all matter in space.