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Astronomers have two ways of measuring the brightness of a star, apparent magnitude and absolute brightness. Which statement best explains the difference between apparent magnitude and absolute brightness?

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Answer:

Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs. (A light-year is the distance light travels in one year — about 6 trillion miles, or 10 trillion kilometers.) Astronomers also measure luminosity — the amount of energy (light) that a star emits from its surface.

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