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A late stage in the life cycle of a star where it expands and cools after exhausting hydrogen in its core.

A type of stellar remnant that can result from the gravitational collapse of a massive star during a supernova, composed almost entirely of neutrons.

A region of spacetime where gravity is so strong that nothing, not even light, can escape from it, often formed from the remnants of a massive star.

A massive star that has an exceptionally luminous appearance and larger radius, often preceding the supernova phase.

A stage in the evolution of low to medium mass stars where helium suddenly ignites in the core, leading to expansion and cooling.

A compact star that is the remnant of a low or medium mass star, no longer undergoing nuclear fusion and emitting energy as it cools.

A stable stage of stellar evolution characterized by the fusion of hydrogen atoms into helium; the Sun is an example.

A collapsing cloud of gas and dust destined to become a star; a young star before nuclear fusion begins.