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OpenStudy (liz_beauty45):
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OpenStudy (liz_beauty45):
Scientists used to believe that the earth was the center of the universe. Which invention was primarily responsible for obtaining evidence against this? A) sextant B) astrolabe C) Hubble telescope D) optical telescope
OpenStudy (mudkillz):
D the optical telescope.
OpenStudy (purple_pink):
this is 7th grade?
OpenStudy (liz_beauty45):
thx theres ur medal
OpenStudy (liz_beauty45):
i dont think its sorted by grade..
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OpenStudy (purple_pink):
@Mudkillz no direct answers please. it is that you guide the asker to the answer. for more info please read the CoC, http://openstudy.com/code-of-conduct
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