Question

which is speed in the world

Answer 1

Blazing Speed: The Fastest Stuff in the Universe. A sequence of radio observations shows a plasma blob moving away from a blazar's core (right) over about 8.4 months. SAN DIEGO -- If you're light, it's fairly easy to travel at your own speed -- that is to say
186,282 miles per second or 299,800 kilometers per second.

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