geocentric theory - earth is the center of the solar system, jupiter - the fastest rotating planet, blue moon - the second full moon in a month, steady state theory - it believes that stars and galaxies may change, but on the whole, the universe has always looked the way it does now, and it always will., heliocentric theory - sun is the center of the solar system, solar eclipse - a phenomenon which occurs when the moon is in between the sun and the earth, lunar eclipse - the earth blocks the light from the sun, big bang theory - believes an expanding universe after the enormous explosion, Aristotle - the first to propose the geocentric view, Aristarchus - the first who suggested the Heliocentric model, Hipparchus - created the first star catalogue, Nicolaus Copernicus - He proposed that the sun was at the center of the universe and all planets orbited around it, Tycho Brahe - the sun and moon revolved around Earth but that all other planets revolved around the sun, constellation - star systems that form patterns, galaxy - ab astronomical system composed of clusters of stars, gas and dust held together by gravity, Hydra - the largest constellation, Pegasus - the winged horse constellation, Gemini - the twins, Betelgeuse - a bright red super giant star found forming Orion’s right shoulder, Aldebaran - the brightest star of taurus,

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