Geography · Astronomy
Which of the following best defines a galaxy?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A collection of planets orbiting a single star
- 2A massive system of billions of stars, gas, and dust bound by gravity✓
- 3A group of comets and asteroids moving through deep space
- 4A cluster of meteoroids entering a planetary atmosphere
Correct answer
A massive system of billions of stars, gas, and dust bound by gravity
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