All stars begin life in the same way. A cloud of dust and gas, also known as a nebula , becomes a protostar, which goes on to become a main sequence star.

Interstellar medium is the space between the stars.

A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

A contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun

A state in which opposing forces or influences are balanced.

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores

A series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left (hot, bright stars) to the lower right (cool, dim stars).

A star that has low surface temperature and a diameter that is large relative to the sun.

Expnding shells of luminous gas that are from a Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying star.

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.

As white dwarfs cool down over the next few trillion years, they'll grow dimmer, eventually freeze solid, and become black dwarf stars that no longer shine.

A red supergiant is an aging giant star that has consumed its core's supply of hydrogen fuel.

A supernova happens where there is a change in the core, or center, of a star. One of the stars, a carbon-oxygen white dwarf, steals matter from its companion star.

Neutron star, any of a class of extremely dense, compact stars thought to be composed primarily of neutrons. Neutron stars are typically about 20 km (12 miles) in diameter.

A black hole is a place in space where gravity pulls so much that even light can not get out.

(H-R) Hertzsprung–Russell diagram

It plots the temperature of stars against their luminosity

Luminosity is an absolute measure of radiated electromagnetic power

The quality or state of giving out or reflecting light

The magnitude (brightness) of a celestial object

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Star Notes

Question	Answer
Life Cycle of a Star	All stars begin life in the same way. A cloud of dust and gas, also known as a nebula , becomes a protostar, which goes on to become a main sequence star.
Interstellar Medium	Interstellar medium is the space between the stars.
Nebula	A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
Protostar	A contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun
Equilibrium	A state in which opposing forces or influences are balanced.
Star	Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores
Main Sequence	A series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left (hot, bright stars) to the lower right (cool, dim stars).
Red Giant	A star that has low surface temperature and a diameter that is large relative to the sun.
Planetary Nebula	Expnding shells of luminous gas that are from a Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying star.
White Dwarf	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 Dwarf	As white dwarfs cool down over the next few trillion years, they'll grow dimmer, eventually freeze solid, and become black dwarf stars that no longer shine.
Red Super Giants	A red supergiant is an aging giant star that has consumed its core's supply of hydrogen fuel.
Supernova	A supernova happens where there is a change in the core, or center, of a star. One of the stars, a carbon-oxygen white dwarf, steals matter from its companion star.
Neutron Star	Neutron star, any of a class of extremely dense, compact stars thought to be composed primarily of neutrons. Neutron stars are typically about 20 km (12 miles) in diameter.
Black Hole	A black hole is a place in space where gravity pulls so much that even light can not get out.
(H-R) Hertzsprung–Russell diagram	It plots the temperature of stars against their luminosity
Luminosity	Luminosity is an absolute measure of radiated electromagnetic power
Brightness	The quality or state of giving out or reflecting light
Absolute Magnitude	The magnitude (brightness) of a celestial object

Created by: Wyatt12_

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