What Are Stars?

Stars, like humans, have a lifecycle: they are born, age, and die. Formed from dust and gas, stars are categorized into three main types based on age and size. Most stars, including the Sun, are main sequence stars, stable and fueled by nuclear fusion. As they age, they become giants, expanding as they exhaust hydrogen and start using helium. Depending on their size, giants may become planetary nebulae or white dwarfs. Supergiants explode as supernovae, potentially forming neutron stars or black holes. The elements released in these explosions contribute to the formation of new stars and planets.

What are stars primarily formed from?

• Clouds of dust and gas

• Molten lava

• Solid rock

• Liquid water

What is the main characteristic of Main Sequence stars?

• They are the coldest stars

• They are the largest stars in the universe

• They are in a stable stage of life

• They are unstable and constantly changing

What happens to a star when it becomes a giant?

• It swells in size

• It stops nuclear reactions

• It becomes cooler

• It shrinks in size

What is the fate of red giants?

• They become black holes

• They explode as supernovae

• They become neutron stars

• They turn into planetary nebulae

What can the core of a supergiant star become after a supernova?

• A neutron star or a black hole

• A main sequence star

• A red giant

• A white dwarf