Concept explainers
Astronomers use a light-year to measure distance. A light-year is the distance light travels in 1 yr. The speed of light is approximately 300,000km/sec.
a. How long is 1 light-year in kilometers?
b. The nearest star (other than the sun) is Alpha Centauri. It is 4.34 light-years from Earth. How far is that in kilometers?
c. How long will it take a rocket travelling 60,000 km/hr to reach Alpha Centauri?
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