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 to a star towards the end of its life cycle?

What is the fate of a star that has used up most of its hydrogen?

Describe the process that occurs when a star's outer layers are ejected.

How does the radiation from a star's core affect its outer layers?

What are planetary nebulae and how long do they last?