Nebula star life cycle

A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born.Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.
Learn about the life cycle of a star. This heat then causes an increase in pressure which pushes against the gravity slowing the collapse of the star. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years.

A star forms from massive clouds of dust and gas in space, also known as a nebula. The larger its mass, the shorter its life cycle. Nebulae are mostly composed of hydrogen. This pressure continues to increase as the nebula gets smaller and the temperature rises, leading to the next stage of a star's life cycle.
Stars are formed in clouds of gas and dust, known as nebulae.

After that a star forms a main sequence star and so on. After around a million years the disk like object forms into a protostar. The exact lifetime of a star depends very much on its size.Very large, massive stars burn their fuel much faster than smaller stars and may only last a few hundred thousand years.

In the first stage a dense clump in a cloud heats up and collapses. But the entire life cycle of a star starts in a nebula.

Kohoutek 4-55 Nebula contains the outer layers of a red giant star that were expelled into interstellar space when the star was in the late stages of its life.

Planetary Nebula + White Dwarf As an aging red supergiant becomes more and more luminous, the outer layers puff out more and more. The dying central star itself cannot be seen, because it is hidden within a doughnut-shaped ring of dust. Life Cycles of Stars A star's life cycle is determined by its mass. The Butterfly Nebula.

... A nebula. In the second stage the dense object starts to spin taking the shape of a disc. It gets to the point where the star loses gravitational hold on its outer layers and they get pushed away the pressure exerted …


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