Star - A ball of hot gas primarily hydrogen and helium that undergoes nuclear fusion, Comet - A loose collection of ice and dust that orbits the sun typically in a long narrow orbit, Geocentric - having or representing the earth as the center, as in former astronomical systems., Satellite - a celestial body orbiting the earth or another planet., Planet - An object that orbits a star is large enough to have become round by its own gravity and has cleared the area, Constellation - A pattern or grouping of stars that suggest the outline of a figure or object, Heliocentric - A term describing a model of the solar system in which Earth and the other planets revolve around the sun, Meteor - A streak of light in the sky made by the burning of a meteoroid in Earth atmosphere, Ellipse - An oval shape which may be elongate or nearly circular of the shape of the planet's orbits,

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