The Life Cycle of Stars From Nebula to Supernova

The video explores the life cycle of stars, starting from a nebula, where dust and gas form a protostar. As gravity increases, nuclear fusion begins, creating a main sequence star. Over billions of years, the star exhausts its hydrogen, becoming a red giant or supergiant. Red giants shed layers to become white dwarfs, cooling into black dwarfs. Red supergiants explode in supernovae, forming neutron stars or black holes. The video concludes with a recap of these stages.

What is the initial stage in the formation of a star?

• A black hole

• A nebula

• A neutron star

• A white dwarf

What process marks the transition from a protostar to a main sequence star?

• Formation of a black hole

• Supernova explosion

• Nuclear fusion

• Gravitational collapse

During the main sequence stage, what balances the inward pull of gravity?

• Magnetic fields

• Outward pressure from nuclear fusion

• Radiation pressure

• Electromagnetic forces

What happens to a star when it runs out of hydrogen fuel?

• It expands and forms heavier elements

• It becomes a black hole

• It turns into a neutron star

• It explodes in a supernova

What is the final stage of a small to medium star like our sun?

• Red supergiant

• Neutron star

• White dwarf

• Black hole

What is the fate of a red supergiant after it explodes in a supernova?

• It forms a neutron star or black hole

• It becomes a white dwarf

• It becomes a protostar

• It turns into a red giant

What is a neutron star?

• A stage before a protostar

• A small black hole

• A type of red giant

• A dense core left after a supernova

Why are black holes called 'black'?

• They emit a lot of light

• Their gravity prevents light from escaping

• They are very cold

• They are made of dark matter

What elements are formed during a supernova explosion?

• Only hydrogen and helium

• Elements heavier than iron

• Only carbon and oxygen

• No new elements are formed

What is the final stage of a white dwarf?

• It explodes in a supernova

• It becomes a black dwarf

• It turns into a neutron star

• It becomes a red giant