ASTRON C10 Chapter 1: Chapter 1
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ASTRON C10 Full Course Notes
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Light travels at 300,000 km/s (186,000 miles/s)(10 trillion km/year is one light-year) so it take long time to reach earth from far away. a. b. c. The speed of light is the greatest speed that is physically attainable for objects trave through space. We are looking backward in time as we view the universe, with distant objects viewe farther in the past than nearby ones. Light from the moon takes 1. 3 seconds to reach us, so we see the moon from 1. 3 se ago. Light from the sun takes 8 minutes to reach us. The distance that light travels in a year is a light-year d. e. Astronomers take photographs of celestial objects takes a veling wed rth in 10 years seconds io. Astronomers also break down an object"s light into its component colors to make a spectru (like a rainbow) a. They use the visible and invisible spectrum (gamma, x-ray, ultraviolet, infrared, radio.
