asteroids - rocky, airless remnants from the early solar system, axis - an imaginary straight line that an object spins around., comets - are small, icy bodies with dust that develop a coma and tail as they approach the Sun., force of gravity - This holds all the objects in the solar system in their orbit around the sun., mass - is a measurement of how much "stuff" or matter is in an object. Not the same as weight., meteoroids - are smaller than asteroids, ranging from pebble-size to objects up to a meter in diameter, orbit - All planets, asteroids, comets, and meteoroids in the solar system move around the sun in one of these., planets - are large, round objects that orbit, or travel around, a star., solar system - The Sun and all the celestial bodies that orbit it., space - The vast expanse where the solar system and its objects reside., tilt - The inclination of the axis of a rotating body, which affects its seasons. (While rotation and tilt are key properties, their direct relation to asteroids, comets, or meteoroids is less significant than gravity and mass)., weight - The force of gravity on an object's mass, a specific measure of mass on a particular planet or celestial body., astronomy - the branch of science that deals with celestial objects, space, and the physical universe as a whole, galaxy - A vast collection of millions or billions of stars orbiting a supermassive blackhole., satellite - Any object man-made or natural in orbit around a planet., constellation - A group of stars that when viewed from Earth forms part of a picture. Often, coupled with a story or mythology.  ,

Space Vocabulary

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