Quote:
Originally Posted by -apoc-
I only know the answer to the first one. It is due to the time it takes for the light to travel to us. So if something is 1 light year away ( a measure of distance) it takes the light 1 year to get to us from there and we are seeing it as it looked 1 year ago. Therefor if something is 14 billion light years away it took 14 billion years for the light to get to us from there and we are seeing it as it was 14 billion years ago. It probably no longer exists and definitely not as we are seeing it so in a way we are looking backwards into time.
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The part I've never heard explained when they use this to date the universe is that if it's 14 billion years away, don't you also have to go backwards to include how long it took for it to GET 14 billion years away for the light to take that long to reach us?
On #2, gravity is always pulling the plane closer to the earth, and lift constantly changes not just with altitude but with weather. A pilot is constantly making little corrections that overcome these forces to stay at a roughly stable altitude.
#3 is definitely that you are being carried along with the earth, as is the air, so your error in landing is much less than any rotation effects.