planet - A body that orbits the sun, has enough mass to assume a round shape, clears out debris from around its orbit, and is not a satellite of another planet., solar eclipse - When the Moon passes between Earth and the Sun, obscuring Earth's view of the Sun., galaxy - A massive gravitationally bound system of billions of stars., orbit - The path of a satellite as it revolves around another body., constellation - An arbitrary formation of stars perceived as a figure or design., ellipse - A closed, symmetric curve shaped like an oval., asteroid - A small celestial body that orbits the sun that is smaller than a planet., luminous - A body that emits self-generated light., non-luminous - A body that does not emit light., leap year - A year containing an extra day.,

solar system definitions

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