The Universe Crossword Puzzle

QUESTIONS LIST: aphelion : object is furthest from the sun, solar nebula : a cloud of dust and gas, galaxy : a large collection of stars, gas, and dust that is held together by gravity, centripetal force : the inward force that causes objects to move in a circular path, solar system : the collection of large and small bodies that orbit our central star, orbit : the path that a body follows as it travels around another body in space, absolute : a measure of how bright a star would be if the star were located at a standard distance, planet : a spherical body that orbits the sun, light year : the distance that light travels through space in one year, star : a larger celestial body that is composed of gas and emits light, universe : space and all the matter and energy in it, apparent : the measure of of a stars brightness as seen from earth, heliocentric : model that depicts earth and other planets orbiting the sun, luminosity : actual brightness of a star, parallax : apparent shift in the position of an object when it is viewed from different locations, gravity : a force of attraction between objects that is due to their masses and the distance between them, geocentric : model that depicts earth as the center of the solar system, perihelion : object is closest to the sun