star - a burning ball of gas held together by gravity, nebula - a huge cloud of gas and dust in space; the birthplace of stars, protostar - a young star that forms when a nebula heats up and contracts causing hydrogen to fuse into helium, main sequence star - a star that is fusing hydrogen in its core (burning); energy out = gravity pulling in, planetary nebula - a layer of gases that forms around a shrinking red giant, red giant - a star that has expanded outward once it starts burning helium in its core; hot core causes outer gases to expand, white dwarf - a very hot, shrinking core of a small or medium sized star; glows very brightly but has begun to die out, black dwarf - the end stage of a low mass star that is no longer giving off energy (shining); none exist in our universe yet, supergiant - a very large star that has used up all of its hydrogen and is now burning helium causing its outer gas layers to expand to a very large diameter, supernova - once the core of a very large star fuses into iron, it heats up and explodes, neutron star - an extremely dense star made of tightly packed particles called neutrons; a couple of cups of this material would weigh more than Mount Everest, black hole - end stage of extremely large stars with gravity so strong that even light cannot escape from it., The Sun - our middle-aged, medium-sized, yellow star; closest star to Earth, Galaxy - A collection of stars, dust, and gas bound together by gravity, spiral galaxy - a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern, Milky Way - the galaxy in which we live,
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Stars & Galaxies
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