(d) Suppose a supernova explosion occurred in a galaxy 5 x 107 light years from here.?
If we are only now detecting the supernova, how long ago did it actually occur? According to Hubble’s law, what is the velocity with which this galaxy is moving away from us?
Space is expanding at about 2.5 x 10^-18/s. Multiply that by 5 x 10^7 light year and you get 1.25 x 10^-10 light year/s.
Multiply by 9.46 x 10^15 meter/light year and you get 1.1826 x 10^5 m/s.
Light Bulb In Microwave Explosion
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