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. ,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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The Answer of 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. ,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

A Giant Star in Another Galaxy Exploded 67 Million Years