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Q: How can the universe expand faster than the speed of light?
Physicist: You’ll often hear that “the universe is expanding faster than the speed of light”. First, the universe doesn’t expand at a particular speed, it expands at a speed per distance. Notice the awkward phrasing there: distant galaxies are “getting farther away”, but oddly enough they are not “moving away”. The easiest way to think about the expansion of the universe is to think about the expansion of something simpler, like a balloon. Light beyond that is still moving at light speed, and it may even be trying to move toward us, but the distance is simply expanding too fast.
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