A cloud-like cluster of stars or a hazy mass of cosmic dust particles and gases that occurs in interstellar space. These are thought to be the birthplace of stars.
The first stage in the formation of a star, consisting of a contracting mass of gases and cosmic dust, but not yet a true star.
A star near the end of the stellar life cycle that has expanded to a much larger size.
The explosive death of a massive star.
A sudden increase in the brightness of a star, which is believed to be from an explosion of the outer shell of a white dwarf star.
White Dwarf Star
A small, hot star, which is actually the left over core of a red giant star that ran out of fuel. These stars are near the end of the stellar life cycle.
A dense ball of atomic particles that remains at the the core of a star after a supernova explosion has destroyed the rest of the star.
A region of space where the pull of gravity is so great the nothing, not even light, can escape. Believed to be the theoretical remains of a super massive star that has collapsed upon itself.
A system of stars, cosmic dust and gas held together by gravity. The one in which we live is called the Milky Way.
When light from a distant cosmic object appears to be stretched toward longer wavelengths, which means the object is quickly moving away from Earth.