A galaxy is observed receding from Earth with a speed of 2800 km/s.If the Hubble constant is 22 km/s per million light-years,estimate how many years ago the light that we presently see from the galaxy actually left the galaxy.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m, A) 1.3 × 10⁸ y B) 4.2 × 10⁸ y C) 4.2 × 10⁷ y D) 1.4 × 10⁷ y E) 4.2 × 10⁶ y

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The Answer of A galaxy is observed receding from Earth with a speed of 2800 km/s.If the Hubble constant is 22 km/s per million light-years,estimate how many years ago the light that we presently see from the galaxy actually left the galaxy.(c = 3.00 × 10⁸ m/s,1 ly = 9.461 × 10¹⁵ m, A) 1.3 × 10⁸ y B) 4.2 × 10⁸ y C) 4.2 × 10⁷ y D) 1.4 × 10⁷ y E) 4.2 × 10⁶ y

A Galaxy Is Observed Receding from Earth with a Speed