Milky Way Galaxy - The galaxy in which Earth and Sun are located, Nebulae - Large cloud of gas & dust in interstellar space; the location of star formation, Star - Sphere like structure with a mass of gas (hydrogen & helium) held together by its own gravity in which the energy is generated by nuclear fusion reactions., Universe  - All of space and the matter space contains., Big Bang Theory - A theory that states the universe began from one point billions of years ago and has been expanding ever since., Comet - Made up of ice, dust and rocky material has a tail that reflects light from stars they orbit., Asteroid - Made up of metal and rocky material., Galaxy - A large group of billions of stars, gas, and dust held together by gravity., Cluster - A group of galaxies., Spiral - Pin-wheel shaped "S" with spiral arms, young galaxy with center black hole bugle, Elliptical  - "Egg" oval shaped with a lot of light & little gas, oldest galaxies, Irregular - No shape a lot of gas and dust so has young stars, Redshift - Celestial object is moving away from us, Cosmic microwave background - Left over energy from the initial explosive evidence of the big bang,

Components of the Universe

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