Stellar evolution

What does the final stage of a star depend on?

• The star’s mass

• The star’s color

• The star’s temperature

• The star’s distance from Earth

How can a star produce light and heat?

• Chemical reactions in its core

• Friction between gases in space

• Energy from planets around the star

• Nuclear fusion of hydrogen into helium

What causes a cloud of gas to collapse and form a star before it begins nuclear fusion?

• The rotation of the galaxy

• The light from nearby stars heating it

• The force of gravity pulling the gas together

• The cosmic microwave background radiation

Which statement best describes how a nebula is related to stars?

• A region of space where stars are destroyed by strong gravity.

• A solid core of rock and metal left after a star collapses.

• A cloud of gas and dust that can form new stars or is left behind when a star dies.

• A group of galaxies held together by gravity

What is the stage of a star called before nuclear fusion begins?

• Protostar

• Supernova

• White dwarf

• Main sequence star

What stage is the Sun currently in?

• Protostar stage

• Red giant stage

• Neutron star stage

• Main sequence stage

What is the final stage of a star with a mass similar to the Sun?

• Neutron star

• Black hole

• White dwarf

• Supernova remnant

Star A becomes a neutron star. Star B becomes a black hole.

Which of the statements are correct?

• Star B had a higher mass than Star A.

• Star A had a lower mass than the Sun.

• Star A is closer to Earth than Star B.

• Star A had a higher temperature than Star B.

Which of the following best describes a supernova?

• A small, cool star that shines faintly

• A cloud of gas and dust where stars are born

• A huge explosion that happens when a massive star dies

• The process of hydrogen changing into helium inside a star

Which statement is correct about the lifespan of stars?

• All stars have the same lifespan because they are made of the same materials.

• High-mass stars live much longer than low-mass stars because they have more fuel.

• Low-mass stars have longer lifespans because they burn their fuel slowly.

• The lifespan of a star depends on its distance from the Earth.