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Nebular Theory (Stars (Content (very hot gas, hydrogen, helium), Red Giant…
Nebular Theory
Stars
Red Giant
When a star is in its last stage, it greatly increases its size and becomes a red giant, then it becomes a white dwarf and finally explodes and becomes a supernova.
White Dwarf
a small very dense star that is typically the size of a planet. A white dwarf is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula.
Black hole
space inside which there is a mass concentration high enough to generate a gravitational field such that no material particle, not even light, can escape from it.
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The stars shine by burning hydrogen to turn it into helium in their nuclei, and later in their lives they create heavier elements.
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Galaxies
A galaxy is a gravitation ally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxies, literally "milky", a reference to the Milky Way.
at least one hundred billion galaxies in the observable universe. They've counted the galaxies in a particular region, and multiplied this up to estimate the number for the whole universe.
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Solar System
Stars Forms
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions"
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