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A star in the stable phase of its life cycle where it's fusing hydrogen into helium in its core.

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

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

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

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

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

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

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

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

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

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