A collection of stars, dust, and gas bound together by gravity is... a. universe b. solar system c. planet d. galaxy explain why
1 answer:
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Answer:
D: 4.6 x
Explanation:
4.6 x 10^{9} = 4,600,000,000
Earth is approximately, 4.6 billion = 4,600,000,000 = 4.6 x 10^{9}