Pluto was discovered in
A) ancient times.
B) 1789.
C) 1859.
D) 1930.
E) 1992.
Question 2
What is the Big Bang?
A) An enormous explosion that organized all matter in the universe.
B) The creation of matter and the universe.
C) The creation of the primeval fireball.
D) An explosion that spewed matter all over the universe.
E) The event that started the expansion of the universe.