1. In February 1987, a supernova was seen to explode in the Large Magellanic Clo

Question

1. In February 1987, a supernova was seen to explode in the Large Magellanic Cloud, a small galaxylike structure near the Milky way galaxy. The supernova was about 1.7 × 105 light years from Earth. How far away was this explosion? Answer in units of km.

2. If it were somehow possible for you to drive your car along some stellar highway in the sky to the location of this explosion, how long would it take you to get there, assuming you drove at 100 km/h km/h? Answer in units of h.

3. Assume a Hubble constant of 70 km/s/Mpc, what is the approximate velocity of a galaxy 1480 Mpc away? Answer in units of km/s.

NEED THE ANSWER FOR NUMBER 2 AND 3

Explanation / Answer

1.

distance = 1.7 x 105 light year

1 light year = 9.46 x 1015 m

so distance = 1.7 x 105 x 9.46 x 1015 = 1.61 x 1021 m = 1.61 x 1018 km

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