Hubble's Law: Estimate the Speed of a Galaxy Away from Us

question 22

Multiple Choice

Hubble's law: Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 10⁸ m/s, 1 ly = 9.461 × 10¹⁵ m, 1 y = 3.156 × 10⁷ s)

• A) 0.1c
• B) 0.3c
• C) 0.5c
• D) 0.7c
• E) 0.9c

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