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A Galaxy Is Observed Receding from Earth with a Speed

Question 50

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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 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 × 10<sup>8</sup> m/s,1 ly = 9.461 × 10<sup>15</sup> m, A) 1.3 × 10<sup>8</sup> y B) 4.2 × 10<sup>8</sup> y C) 4.2 × 10<sup>7</sup> y D) 1.4 × 10<sup>7</sup> y E) 4.2 × 10<sup>6</sup> y


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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