Author Question: The main source of energy for a star as it grows in size to become a red giant is A) hydrogen ... (Read 52 times)

erika · **on:** Jul 27, 2018

The main source of energy for a star as it grows in size to become a red giant is

A) hydrogen fusion in the central core.
B) helium fusion in the central core.
C) hydrogen fusion in a shell surrounding the central core.
D) gravitational contraction.

Question 2

Which two properties are most important in determining the surface temperature of a planet?

A) composition and distance from the Sun
B) size and chemical composition
C) size and atmosphere
D) internal temperature and atmosphere
E) distance from the Sun and atmosphere