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Star Cycle Vocab

TermDefinition
Life Cycle of a Star The sequence of changes that occur in a star as it ages.
Interstellar Medium A thinly spread area of gas and dust. Gas is mainly hydrogen. Dust is mainly carbon and silicon.
Nebula Interstellar Medium begins to collect into big clouds.
Protostar Inside the nebula are greater and lesser gravity, causing the dust and gas to pull together.
Equilibrium A battle between gravity and gas pressure.
Star Formed by nuclear fusion process. Very hot ball of gas with hydrogen fusing with helium at the core.
Main Sequence Phase the stars live in. Stars spend most of their lives in this phase.
Red Giant Type of star.
Planetary Nebula A type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives
White Dwarf a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense. Doesn't have much volume.
Black Dwarf A theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light.
Red Super Giants stars with a supergiant luminosity class (Yerkes class I) of spectral type K or M. They are the largest stars in the universe by volume.
Black Hole a region of spacetime where gravity is so strong that nothing, even light, can escape from it.
Hertzsprung–Russell diagram Plots the temperature of stars against their luminosity or the color of stars against their absolute magnitude.
Luminosity an absolute measure of radiated electromagnetic power, the radiant power emitted by a light-emitting object.
Brightness An attribute of visual perception in which a source appears to be radiating or reflecting light.
Absolute Magnitude A measure of the luminosity of a celestial object, on an inverse logarithmic astronomical magnitude scale.
Temperature (K) Measured in Kelvin. Color of star depends on temperature. Increases from right to left.
H-R Diagram Plots each star on a graph and measures the star's magnitude against its brightness.
Apparent Magnitude Tells us how bright an object appears from earth.
Spectral Class Stars are classified by the elements they absorb.
Created by: Manachanwa
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