Why Hasn't the Universe Collapsed Into a Giant Black Hole? - Ask the Expert #13

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George Musser, contributing Editor at Scientific American magazine, answers your questions!

Questions:

1.sl270703: Lets say im an alien on a ship 65million or more light years away. using a telescope i look at earth and i see dinosaurs living their daily lives. If my ship started traveling towards earth near the speed of light. Would I see the dinosaurs moving faster? fast forwarded?

2. lordv27: If all movement is relative, how can there be a speed limit? In order to measure speed you have to measure it against something. So... what is the speed limit measured against?

3. Shaido666: If a black holes event horizon gets bigger every time its density gets bigger, ie. it "absorbs" mass, why hasn't the whole universe collapsed into an enormous black hole yet? Shouldn't this kind of expanding black hole be getting bigger exponentially? And will this be the end of our universe and possibly the birth of a new one (or where ours began, a big bang)?

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