Question

question 11
5 pts
after its temperature rises to 10,000,000°c, a protostar becomes a star when
nuclear fusion ends.
nuclear fusion begins.
nuclear fission begins.
nuclear fission ends.

Explanation:

A protostar becomes a star when nuclear fusion begins. Nuclear fusion in a star's core converts hydrogen into helium, releasing energy that counteracts the gravitational collapse of the star - material. This balance marks the transition from a protostar to a star. Nuclear fission is not the process that makes a protostar into a star.

Answer:

B. nuclear fusion begins.