Where are stars formed?
A. A planetary nebula
B. Near the center of the universe
C. A nebula
What is a black hole?
A. A collapsed star with gravity so dense nothing can escape it
B. A cool spot on the surface of a star
C. An area in space where stars are created
What factor(s) impacts the life cycle of a star?
A. Energy
B. Mass
C. Size
D. All of the above