At about what fraction of the speed of light do today's spacecraft travel?
A)1/2
B)1/10
C)1/100
D)1/1,000
E)1/10,000

Question

Quizplus · Accepted Answer

Today's spacecraft travel at about 1/10,000 the speed of light, which is significantly slower than the fractions listed in the other options. The speed of light is approximately 299,792 kilometers per second, and the fastest spacecraft, such as the Parker Solar Probe, can reach speeds of around 700,000 kilometers per hour, which is about 0.064% of the speed of light.

At About What Fraction of the Speed of Light Do