Block, SkipCaptcha, nsAm_Govt_101RO, nsAm_Govt_101RW, nsAm_Govt_101_ta, nsTeam2RO, nsTeam2RW, nsTeam2_talkRO, nsTeam2_talkRW
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<font color=#3F3F3F size=3>310-230 BC, Greek astronomer, proposed that the sun is at the center of the universe.