A Giant Star in Another Galaxy Exploded 67 Million Years

question 24

Multiple Choice

A giant star in another galaxy exploded 67 million years ago, forming a supernova. The event is observed by an astronomer on Earth. Estimate the speed at which the supernova (and its galaxy) recedes from Earth 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) 1200 km/s
• B) 670 km/s
• C) 1500 km/s
• D) 2700 km/s
• E) 4700 km/s

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