Space questions, answered
How fast does light travel?
Light travels at about 299,792 kilometres per second (186,282 miles per second) in a vacuum — the fastest speed anything can move in the universe.
At that speed light could circle the Earth about seven and a half times in a single second. It still takes about 8 minutes 20 seconds to reach us from the Sun, and over four years from the next-nearest star.
Nothing with mass can reach the speed of light — it's a hard cosmic speed limit built into the fabric of space and time, first pinned down by Einstein's relativity.
Sources: NASA — the speed of light
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