If the big bang happened 13.8 billion years ago, and the universe is 93 billion light years in diameter, how did the universe expand faster than light?
In: Physics
If you stretch space the distance between two points can be increasing even if they are not moving in space.
If all of space if stretching, two far away points can have the distance between them increasing faster than the speed of light even if neither is moving. So in 13 billion years two points far apart can spread to be 93 billion light years apart even if they are not moving.
The rule is “no known object can travel faster than the speed of light…”
Space itself however is not an object, and may bend or warp at any speed.
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If we send a spaceship at the speed of light in one direction from earth, and send an identical ship at the same speed in the other direction. Aren’t they moving away from each other faster than the speed of light?
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