Fusion is the process by which:
A) dust grains and ice crystals coalesce to form planetesimals.
B) massive protoplanetary cores pull gas onto themselves to create giant planets.
C) clouds of interstellar gas and dust contract to form protostars.
D) elements are transformed into heavier elements by nuclear reactions.

Question

Quizplus · Accepted Answer

Fusion is the process by which lighter elements fuse together to form heavier elements, releasing energy in the process. This is what powers stars and produces elements beyond helium in their cores.

Fusion Is the Process by Which