[单选题]
It can be shown that the app2 clcy5 dww-y*roximate age of the universe is 68rmta4fdi)owhi(by p 4 9f4 e1/H, where H is the Hubble constant. Taking H = fei 6ay( brm9th)8i44fdpow420 km/s/Mly, estimate the age of the universe, in years.
A. 15 thousand years
B. 15 million years
C. 15 billion years
D. 15 trillion years
Post time 2024-1-22 00:41:59