An oval or egg shaped galaxy with older stars and little gas and dust.

A very large group of stars held together by gravity; few million to a few billion stars.

A galaxy that is neither spiral nor elliptical.

Regions of gas and dust plus young stars that wind outward from the central area bulge.

A rotating type of galaxy with a central bulge and spiral arms with stars, gas and dust.

The super dense core left after a supergiant explodes as a supernova.

A star that is fusing hydrogen atoms to helium; a star in the main portion of its life.

Is created when gravity pulls some of the gas and dust in a nebula together.

The remnant of a massive star after it explodes as a supernova.

Stage in a star's development when the inner helium core contracts while the outer layers of hydrogen expand.

A tremendous explosion that occurs when the core of a star is mostly iron.

A small to mid-sized star that has collapsed.

A reaction that produces larger materials from the collision of smaller atoms.