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A small, dense stellar remnant left after a red giant sheds its outer layers, no longer undergoing nuclear fusion.

A system of two stars that are gravitationally bound and orbit a common center of mass.

An early stage of a star's formation where the nebular material is contracting before nuclear fusion has begun.

A small and relatively cool star on the main sequence, of spectral type K or M.

An incredibly dense stellar remnant composed almost entirely of neutrons, left over from the supernova explosion of a massive star.

A region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.

A powerful and luminous stellar explosion that marks the end of a massive star's life cycle.

A rare, massive star with a high rate of mass loss through powerful stellar winds.

A dying star that has exhausted its core hydrogen and expanded to many times its original size.

A star whose brightness as seen from Earth fluctuates, either due to intrinsic or extrinsic factors.

A massive star with high luminosity and a surface temperature exceeding 10,000 K.