Planetary nebula

The video explains the life cycle of a large star, focusing on the stage when it exhausts its hydrogen fuel. At this point, the star's outer layers are expelled and ionized, forming a planetary nebula. These nebulae are short-lived in cosmic terms, lasting only tens of thousands of years.

What happens towards the end of a large star's life cycle?

• It turns into a white dwarf.

• Its outer layers are ejected.

• It expands into a red giant.

• It becomes a black hole.

What is the primary element used in nuclear fusion in large stars?

• Oxygen

• Hydrogen

• Carbon

• Helium

What causes the outer layers of a star to be ejected?

• Gravitational collapse

• Radiation from the core

• Cosmic winds

• Magnetic fields

How long do planetary nebulae typically last in cosmic terms?

• A few billion years

• A few million years

• A few thousand years

• A few hundred years

What is a planetary nebula?

• A stage in a star's life cycle

• A type of galaxy

• A cluster of stars

• A black hole