What does the Hertzsprung-Russell Diagram graph?

What is a star's life cycle determined by?

What is a huge group of solar systems, dust, and gas held together by gravity?

A low-mass or medium-mass star will become a ________ after the white dwarf stage

Astronomers think that in the future the universe will continue to

What does a light year measure?

A large cloud of gases and dust in a galaxy where new stars are born is called a

The explosion of a supergiant is called a(n)

An object with gravity so strong that no light can escape is a(n)

A(n) ___________ galaxy looks like a round or flattened ball.

Scientists believe the universe began with an explosion called the__________

Black Holes can only be made from red giants.

A star's apparent brightness is the star's brightness as seen from earth.

When a Super-Giant dies the next phase is a Supernova

The Milky Way is a Spiral Galaxy

The coolest stars are blue in color