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.,

8th Astronomy

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