The Sun's source of energy at the present time is thought to be
A) thermonuclear fusion (combining)of hydrogen atoms.
B) thermonuclear fission (splitting)of heavy elements into hydrogen.
C) chemical burning of hydrogen gas with oxygen.
D) gravitational contraction.

Question

Quizplus · Accepted Answer

The Sun's source of energy comes from thermonuclear fusion which is the combustion of hydrogen gas into helium in its core. This process releases a tremendous amount of energy and is what allows the Sun to shine.

The Sun's Source of Energy at the Present Time Is