How far is a galaxy from Earth if it is receding from Earth at a speed of 0.1c? A) 3.1 × 10²⁰ m B) 1.3 × 10²² m C) 1.3 × 10²⁵ m D) 3.4 × 10²⁸ m E) 1.3 × 10³⁰ m

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Quizplus · Accepted Answer

The speed of recession (0.1c) can be used with Hubble's Law (v = H₀d) to find the distance. Assuming H₀ ≈ 70 km/s/Mpc, the calculation gives a distance of approximately 1.3 × 10²⁵ m.

How Far Is a Galaxy from Earth If It Is