Geocentric, model that used Earth as the center., Heliocentric, model that Earth and other planets orbit the sun., Universe, the word that scientists use to describe space and all of the energy and matter in it., Scientific Theory, is an explanation or model backed by results obtained from many tests or experiments., Big Bang theory, states that the universe began between an expansion 13-15 billion years ago exploded and began expanding in all directions., Planet, A relatively large spherical body that orbits a star., Solar System, The sun and all of the planets and other bodies that travel around., Nebula, A large cloud of gas and dust in interstellar space; a region in space where stars are born, Supernova, A gigantic explosion in which a massive star collapses and throws its outer layers into space., Galaxy, A collection of stars, dust, and gas bound together by gravity., Star, A large celestial body that is composed of gas and that emits light; the sun is a typical star, Gas Giant Planet, A planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune, Terrestrial Planet, One of the highly dense planets nearest to the sun; Mercury, Venus, Mars, and Earth

Astronomy

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