The birth of the solar system occurred ________.
A) about 500 million years ago
B) about 5 billion years ago
C) about 40 billion years ago
D) about 500 billion years ago
E) about 5 million years ago
Question 2
The shape of the Milky Way is similar to a(n) ________.
A) circle
B) sphere
C) spiral-shaped disk
D) pancake
E) oblate spheroid