Stars undergo a life cycle starting from a nebula, where dust and gas coalesce under gravity to form a protostar. Depending on their mass, stars can live for billions of years, eventually expanding into giants or supergiants. As they exhaust their fuel, stars may become white dwarfs, neutron stars, or black holes. Black holes have intense gravitational forces that prevent even light from escaping.

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

• A black hole

• A supernova

• A white dwarf

• A nebula

What is the term for the first phase of a star's life?

• Neutron star

• Protostar

• White dwarf

• Supernova

How long can stars live, depending on their mass?

• From a few million to 200 million years

• From a few thousand to 200 thousand years

• From a few billion to 200 billion years

• From a few hundred to 200 hundred years

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

• It can become a white dwarf, neutron star, or black hole

• It turns into a comet

• It disappears completely

• It becomes a planet

What is a supernova?

• A small star that has cooled down

• A giant or supergiant star that has exploded

• A new star being formed

• A black hole absorbing light