According to Big Bang Theory, the Universe began about __________ billion years ago.

1. 1 light year = ? 

A. 9.5x106 km
B. 9.5x109 km

C. 9.5x1012 km

D. 9.5x1018 km

2. The planets visible to us without using a telescope are __________.

A. 3
B. 4

C. 5

D. 6

3. According to Big Bang Theory, the Universe began about __________ billion years ago.

A. 10 – 20

B. 20 – 30
C. 30 – 40
D. 40 – 50