Question

1. place the following in sequence: a) hubble makes his discoveries; b) cosmic background radiation is first detected; c) lemaitre proposes his theory

a. a, b, c
b. b, c, a
c. c, a, b
d. c, b, a

Explanation:

In 1927, Lemaître proposed his theory. Edwin Hubble made his discoveries in the 1920s - 1930s. Cosmic background radiation was first detected in 1964. So the correct order is Lemaître's theory first, then Hubble's discoveries, and then the detection of cosmic - background radiation.

Answer:

c. C, A, B