Which phenomenon supports the idea that the universe is expanding?

What does it mean when an object is redshifted?

What is the term for a star that suddenly increases in brightness (like an explosion) and then fades?

What is a celestial body that is composed of gas and emits light from nuclear fusion reactions?

What type of galaxy is the Milky Way classified as?

What are the two main components of the Sun?

What is the term for a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction?

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

Which force is primarily responsible for the collapse of a gas cloud to form a star?

What is the term for the region in space where new stars are born?

This is the name of a meteoroid that starts to burn in Earth's atmosphere.

This is the name of a meteoroid that strikes the surface of the Earth.

Comets can be primarily found in the Oort cloud and the:

An object that is blue shifted is:

The most abundant type of stars fall into this category

Our sun is this type of star:

Giant stars will eventually burn out and create these:

The densest objects in the universe

A spinning neutron star is called a: