Which is the final event that occurs when a star is forming?

The outer layer of the star expands.
Gravity pulls gas and dust together.
A black hole forms as the core collapses.
Nuclear fusion begins under high pressure.

1 answer

The final event that occurs when a star is forming is nuclear fusion begins under high pressure. This process marks the transition from a protostar to a main-sequence star, as fusion of hydrogen into helium generates the energy that sustains the star and counteracts gravitational collapse.