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Light in a vacuum travels at a constant speed of 3x108 m/s. If the Moon's average...

Light in a vacuum travels at a constant speed of 3x108 m/s. If the Moon's average distance from the Earth is 38848,808 km, how long would it take for a beam of light to travel from the Earth, to the Moon, and back to the Earth again?

A star has a surface area of 6.722x1018 m2. How much power does it radiate if it has a surface temperature of 7,943 K?

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