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A star that has exhausted the hydrogen in its core and begins to burn helium; it greatly increases in size and cools. Duration: Around 1 Billion Years.

An expanding shell of gas that is ejected from a star during the later stages of its evolution. Duration: Tens of Thousands of Years.

A star in the longest phase of its life, where hydrogen is fused into helium in its core. Duration: Varies, 10 Billion Years for a sun-like star.

The stage in a star's life cycle where the core contracts and the temperature rises enough to fuse helium into carbon. Duration: Approximately 100 Million Years.

A phase late in the life of a star during which it has a distinct core of carbon and oxygen and burns helium in a shell outside the core. Duration: Few Million Years.

A small, dense star that is the remnant of a low-to-intermediate mass star. No nuclear fusion; the star glows due to residual heat. Duration: Could shine for a trillion years before cooling into a black dwarf.

An explosive death of a star, often resulting in a neutron star or black hole, accompanied by a short-lived, extremely bright outburst of radiation. Duration: Event spans over few days, the supernova remnant can persist for thousands of years.

A region in space with a gravitational pull so strong that nothing, not even light, can escape from it; formed from the remnants of the most massive stars. Duration: Theoretical evaporation via Hawking radiation over a timescale much longer than the current age of the universe.

A highly dense remnant of a supernova composed almost entirely of neutrons, with an immense gravitational field. Duration: Potentially up to 10^13 years before spinning down.