What is the life cycle of a star from birth to death?

Answer 1

the smaller the starting mass of a star is, the longer it will live

In the clouds of dust and gases, nebula. Hydrogen atoms forms a spinning cloud of gas and eventually pulls more hydrogen gas to the spinning cloud. As it spins, hydrogen atoms start to collide with each other and hydrogen gas heats up. When this reaches #15,000,000^@C# nuclear fusion begins and causes to form a new star or protostar.

Once a protostar forms its life cycle is fixed.

Medium-sized star #rarr#red giant or super giant

if a star started with a small mass#rarr# main-sequence stars#rarr#white dwarf#rarr#black dwarf

if a star is a low mass red giant#rarr#white dwarf #rarr#black dwarf (dead star)

if a star is super massive#rarr# super red giant#rarr#supernova very high mass#rarr#Black Hole

if a star is massive red giant#rarr#supernova high mass#rarr#neutron star

Remember that after a supernova, another nebula will form. Neutron stars and blackholes are the core of a star.

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Answer 2

A star like the Sun eventually runs out of hydrogen fuel and expands into a red giant. For lower-mass stars, this phase ends with the shedding of its outer layers, forming a planetary nebula, while the core becomes a white dwarf. For higher-mass stars, their lives end in explosive supernova events, leaving behind either a neutron star or a black hole, depending on their initial mass. A star is formed as a protostar from a dense molecular cloud, and evolves into a main sequence star where nuclear fusion of hydrogen into helium occurs in its core.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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