Light Matters
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chapter 02
The speed of light
step 01
How fast is light?
light
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0:25
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how fast · is light
L
space · one flash · expands at $c$
S
A
speed of light · c
299,792 km/s
Earth laps · per second
7.5 ×
Moon → Earth
1.3 s
Sun → Earth
8 min 19 s
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