Hubble time conservation
2009-04-28 10:54 pm
Hubbe constant H = 75 km/sec/Mpc. As km and Mpc are units of distance, they cancel if you do the unit conservation right, and H's units work out to 1 / time. That means that 1 / H is a time, which is length of time it would take for galaxies to get to be as far apart, if they had always moving at their current speeds. Calculate the Hubble time in billions years
回答 (1)
2009-04-29 4:16 am
✔ 最佳答案
1 km = 1000 m1 pc (parsec) = 3.1 x 10^16 m (or 3.26 light years)
hence, 1 Mpc = 3.1 x 10^22 m
therefore, 75 km/s per Mpc = 75000 m/s per 3.1 x 10^22 m
= 2.42x10^-18 s^-1
The Hubble time = 1/2.42x10^-18 s = 4.1x10^17 s = 13 billion years
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