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Term

Universe
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8th Astronomy

Astronomy

TermDefinition
Universe Outer space and everything in it.
Star An object made of gas that gives off energy.
Nebula A large cloud of gas and dust in space where stars form.
Galaxy A large grouping of stars in space.
Spiral Galaxy A galaxy with a bulge in the center and distinctive spiral arms.
Irregular Galaxy A galaxy with an irregular shape.
Elliptical Galaxy A spherical or elongated-shaped galaxy.
Milky Way Galaxy The name of the galaxy where we live.
Magnitude Brightness of star based on distance.
H – R Diagram Shows the classification of stars (magnitude, luminosity, and temperature).
The sun Main sequence star which the planets and other objects in our solar system revolve.
Luminosity The brightness of an object in space compared to our sun.
Big Bang The theory that is the leading explanation about how the universe began.
Protostar Young star still gathering mass
Main Sequence Star Stage after protostar. Star that begins hydrogen fusion.
Red Giant Stage after main sequence. No more hydrogen fusion. Star begins to cool down and increase in size.
White Dwarf Stage after red giant. Remaining core of red giant.
Supernova Stage after red supergiant. Explosion that throws out elements into space.
Black Hole Stage after supernova. Core collapses on itself. Intense gravitational pull not even light escapes.
Black Dwarf Stage after white dwarf.
Neutron Star Stage after supernova. Small dense collapsed core of massive star.
Created by: NEISDSci
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