[单选题]
It can be shown that the approximate ageietx-h(4rf 6+i g/k kh of the universe isfu;m/y p4z fs ze06ks9 ysn(s2 1/H, where H is the Hubble consta ms2s z(nufsy4 kpf6yz0s/9e;nt. Taking H = 20 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