Question

1. what factors need to be in a \stellar nursery\ for a star to be \born\? a. there must be helium and hydrogen. b. the nebula must be large enough so its gravity makes it collapse on itself. c. there must be more potential energy than kinetic energy in the nebula. d. all of the above

Explanation:

• Option A: Stars form from clouds of gas, mainly hydrogen and helium, so this is a necessary factor.
• Option B: A large enough nebula (stellar nursery) has sufficient gravity to cause collapse, which is essential for star formation.
• Option C: For collapse to occur, potential energy (due to gravity) must exceed kinetic energy (of gas particles moving), so this is also a factor.

Since A, B, and C are all correct, the answer is D.

Answer:

D. All of the above