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Download Gravity/An invisible force that pulls a less massive object - Zoe-s-wiki
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Gravity/An invisible force that pulls a less massive object to a more massive object orbit/the path of one object in space around another object solar system/the sun and everything that revolves around the Sun galaxy/a system that is made up of billions of stars, star clusters and glowing clouds of dust and gas universe/all of the galaxies and the space around them; everything in space nebula/a cloud of dust and gas within a galaxy Big Bang Theory/the theroy that the universe was created by a huge explosion trajectory/the curve that a body in space takes in orbit Revolution/an object spinning around another object (Earth traveling around the sun) rotation/a planet spinning on its axis; an object spinning in isolation Geocentric/the theory that Earth is the center of our solar system; it stated that the sun revolves around the Earth Heliocentric/the correct theory that the sun is the center of our solar system; Earth revolves around the sun Ptolemy/astronomer who came up with the first theory about the universe; geocentric theory Copernicus/astronomer who challenged the geocentric theory; came up with the heliocentric theory Galileo/first astronomer to use the telescope lunar Eclipse/an eclipse of the moon; when the moon passes into the shadow of Earth solar Eclipse/an eclipse of the sun; when the moon passes directly between our space on Earth and the sun gibbous/the moon phase when approximately 3/4 of the surface is reflecting the sun's light crescent/thin curved shape of the moon when it's at its smallest waning/growing smaller waxing/growing larger
