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Life Cycle of a Star
Transcript of Life Cycle of a Star
Life Cycle of a Star By: Gianni Bustamante
A Super Nova
A black hole
A Red Giant
A white Dwarf
A Nebula is the start of a stars life cycle. A nebula is a cloud of dust, hydrogen, helium and other gases. A nebula is formed when a star explodes which you will see later. A nebula is visible in the night sky as a bright patch.
A protostar is the second stage of a stars life cycle. A protostar is a cloud of gas developing into a star. A celestial object made of a contracting cloud of interstellar medium (mostly hydrogen gas) that eventually becomes a main sequence star. So a protostar is what a nebula eventually turns into.
The star is the third stage of a star. A protostar turns into a star after a few years. Stars are made of very hot gas the gas is made of hydrogen and helium, which are the two lightest elements. Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements.
The red giant is the fourth stage of a stars cycle. A Red Giant star is formed when a star like our sun, or one larger, runs out of its hydrogen fuel. It is made of hydrogen and atoms that are combined together to form helium atoms. Red giants are stars that have exhausted the supply of hydrogen in their cores and have begun thermonuclear fusion of hydrogen in a shell surrounding the core.
A white dwarf is the last stage of a stars life cycle. White dwarfs are made mostly of carbon and oxygen. In stars like the Sun, the inward pull of gravity is balanced by the outward push of the high-temperature hydrogen in the center fusing into helium and releasing energy in the process. There is no nuclear fusion in a white dwarf.
The brilliant point of light is the explosion of a star that has reached the end of its life, otherwise known as a supernova. Supernovas can briefly outshine entire galaxies and radiate more energy than our sun will in its entire lifetime. They're also the primary source of heavy elements in the universe.
A black hole is defined as a region of spacetime from which extremely strong gravity prevents anything, including light, from escaping. We know that matter falling into black holes is no different from the matter which can be found lurking around the rest of the Universe.