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Astronomy Solar System

study for final

AB
gravityAn invisible force that pulls a less massive object to a more massive object
orbitthe path of one object in space around another object
solar systemthe sun and everything that revolves around the Sun
galaxya system that is made up of billions of stars, star clusters and glowing clouds of dust and gas
universeall of the galaxies and the space around them; everything in space
nebulaa cloud of dust and gas within a galaxy
Big Bang Theorythe theroy that the universe was created by a huge explosion
revolutionan object spinning around another object (Earth traveling around the sun)
rotationa planet spinning on its axis; an object spinning in isolation
geocentricthe theory that Earth is the center of our solar system; it stated that the sun revolves around the Earth
heliocentricthe correct theory that the sun is the center of our solar system; Earth revolves around the sun
Galileofirst astronomer to use the telescope
lunar eclipsean eclipse of the moon; when the moon passes into the shadow of Earth/
solar Eclipsean eclipse of the aun; when the moon passes directly between our space on Earth and the sun
gibbousthe moon phase when approximately 3/4 of the surface is reflcting the sun's light
crescentthin curved shape of the moon when it's at its smallest
waninggrowing smaller

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