This figure shows an all-sky map of the cosmic microwave background recorded by the wmap telescope. how long did this light travel through space before it reached the telescope?

The speed of light in a vac uum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.

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