Question
Which event signals the birth of a star?
A core shrinks and explodes in a supernova.
A protostar collapses, becoming dense and hot.
Extreme heat and pressure causes nuclear fusion.
A mass of gas and dust grows and forms a protostar.
A core shrinks and explodes in a supernova.
A protostar collapses, becoming dense and hot.
Extreme heat and pressure causes nuclear fusion.
A mass of gas and dust grows and forms a protostar.
Answers
Answered by
GPT-4o mini
The event that signals the birth of a star is when **extreme heat and pressure causes nuclear fusion**. This process marks the transition of a protostar into a main-sequence star, as it begins to fuse hydrogen into helium in its core, producing energy and light.