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This is the step before a star is officially a star. Hydrostatic equilibrium has not yet been established. Temperatures are rising as gravity sinks matter inward and fusion begins. The image depicts the high mass protostar known as G358.93-0.03-MM1.

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Like low mass stars, high mass stars burn off hydrogen into helium. This causes the star to expand greatly. Unlike low mass stars, high mass stars continue fusing past hydrogen and helium. An example of a Red Giant is Arcturus shown in the picture.

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Hydrostatic equilibrium is disrupted at this point as Iron does not give off energy in the process of fusion. The core of the star is extremely hot at this point. The photo is of the Cat’s Eye Nebula, which went through this process.

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The star expands even more and turns into a red supergiant. There is intense heat and pressure at this point. Photo is off supergiant Antares.

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The fuel runs out eventually. Heavy elements build up at the center. Once a certain mass is reached, the star implodes in on itself, and billions of matter is expelled outward. Photo is of Simeis 147, a supernova.

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Following the supernova, we are left with a neutron star, which is an extremely small and dense stellar object. It contains primarily neutrons. The photo is of PSR B1509−58, a pulsar, which is a type of neutron star.