Download ight whizzes from Earth to the Moon and back in about 2.5 seconds

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S 0.1.2
actual size:
5.5” w x 17” H
How
FAST is
LIGHT?
L
ight whizzes from Earth
to the Moon and back in about
2.5 seconds—that’s only 768,000
km (480,000 miles).
The distances between stars and
galaxies are much greater, so
scientists measure them in lightyears. One light-year equals the
distance light travels in one year—
almost 9.5 trillion km (6 trillion miles).
Distances within our Solar System
are measured in smaller increments.
A light-minute is 18 million km (about
11 million miles); a light-hour is 1.08
billion km (almost 700 million miles).
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