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Universe & Space

galaxy a system of billions of stars, together with gas and dust, held together.
star a fixed luminous point in the sky, which is a large body like the sun.
planet a celestial body moving in a elliptical orbit around a star.
moon a natural satellite of any planet.
sun the star around which earth orbits.
solar system the collection of the 8 planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids and comets.
rotation the action of rotating around an axis or center.
black hole a region of space having a gravitational field so intense that no matter or radiation can escape.
gravity the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
asteroids a small rock body orbiting the sun. these range in size from 600 miles across to dust particles.
Created by: NR100099