How long does the protostellar stage last for a star like our Sun?
A) 1 million years
B) 3 million years
C) 10 million years
D) 30 million years
E) 100 million years
Question 2
The terrestrial planets in our solar system are
A) Mercury, Venus, Earth, and Mars.
B) Jupiter, Saturn, Uranus, and Neptune.
C) Mercury, Venus, Earth, Mars, and Pluto.
D) Jupiter, Saturn, Uranus, Neptune, Pluto, and Eris.