Milky Way Galaxy - the galaxy in which Earth and Sun are located, Nebulae - large cloud of gas and dust in interstellar space; the location of star formation, Star - a celestial body consisting of a mass of gas (hydrogen and helium) hy held together by its own gravity in which the energy is generated by nuclear 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., Asteroid - made up of metal and rocky material., Galaxy - a large group of stars, gas, and dust held together by gravity., Cluster - a group of galaxies.,

Components of the Universe

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