Question

A star is thought to be born when

a. a protostar reaches a temperature high enough for nuclear fusion to begin.
b. a red giant collapses on itself and becomes a black hole.
c. pressure within a protostar becomes so great that a supernova occurs.
d. increasing heat within a supergiant causes gravity to be greater than pressure.

Answer 1

a protostar reaches a temperature high enough for nuclear fusion to begin.

Answer 2

a. a protostar reaches a temperature high enough for nuclear fusion to begin.

Step-by-step explanation:

• A protostar is a very young star that is gathering mass a form the stellar mass, supported by the pressure and ends with an inflating gas and the energy generated produces the stars that come from nuclear fusion occurs at the centre of the rotating disk.