The Life Cycle of Stars and the Impact of Mass

The video explains the life cycle of stars, starting from their formation as nebulae, progressing through the protostar and main sequence stages, and eventually evolving into red giants or supergiants. Depending on their mass, stars may end as white dwarfs, neutron stars, or black holes. The process of nuclear fusion is central to these transformations, producing elements up to iron. Supernovae spread these elements across the universe, contributing to the formation of new stars and nebulae.

What is the initial stage of a star's life cycle?

• Red Giant

• Nebula

• Supernova

• White Dwarf

What process occurs in a protostar that leads to the formation of a main sequence star?

• Gravitational Collapse

• Chemical Reaction

• Nuclear Fission

• Nuclear Fusion

During the main sequence stage, what happens to smaller nuclei?

• They are ejected from the star.

• They remain unchanged.

• They are split into smaller atoms.

• They are fused into larger nuclei.

What is the fate of a star similar in size to our sun after it expands?

• It explodes in a supernova.

• It collapses into a white dwarf.

• It becomes a black hole.

• It turns into a red supergiant.

What is the result of a supernova explosion?

• Creation of a neutron star or black hole

• Formation of a new galaxy

• Transformation into a red giant

• Expansion into a main sequence star