Life Cycle of Stars and Their Stages

The video explains the life cycle of stars, starting with the formation of a protostar from dust and gas. It covers the main sequence stage where stars fuse hydrogen, the red giant phase where helium is fused, and the eventual formation of a white dwarf. For larger stars, the video describes the red supergiant phase, supernova explosions, and the formation of neutron stars or black holes.

What initiates the formation of a protostar?

• Gravitational attraction

• Nuclear fusion

• Magnetic fields

• Electromagnetic radiation

During the main sequence phase, what element is primarily fused in the star's core?

• Iron

• Helium

• Carbon

• Hydrogen

What happens to a star similar in size to the Sun when it runs out of hydrogen?

• It immediately becomes a white dwarf

• It expands into a red giant

• It explodes in a supernova

• It becomes a black hole

What is the final stage of a Sun-like star after it becomes a white dwarf?

• Supernova

• Black dwarf

• Neutron star

• Red supergiant

What is a red supergiant?

• A star that is forming from a protostar

• A star that has exploded

• A small star that has cooled down

• A massive star that has expanded after hydrogen depletion

What is left behind after a supernova explosion of a massive star?

• A protostar

• A neutron star or black hole

• A red giant

• A white dwarf

What is the fate of a massive star's core if it is extremely dense?

• It becomes a protostar

• It forms a black hole

• It turns into a red giant

• It becomes a white dwarf

Which star is mentioned as a red supergiant nearing the end of its life?

• Vega

• Betelgeuse

• Sirius

• Polaris

What is the main difference in the life cycle of stars similar to the Sun and those much larger?

• Sun-like stars become black holes

• Massive stars do not undergo supernova

• Sun-like stars end as black dwarfs, massive stars may become neutron stars or black holes

• Massive stars end as white dwarfs

What is the final stage of a massive star if it is not massive enough to become a black hole?

• Neutron star

• White dwarf

• Protostar

• Red giant