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Cain, Fraser, and Pamela L. Gay. "Ep. 49: Mercury." Astronomy Cast RSS. Fraser Cain, 13 Aug. 2007. Web. 19 Mar. 2013

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Cain, Fraser, and Pamela L. Gay. "Ep. 49: Mercury." Astronomy Cast RSS. Fraser Cain, 13 Aug. 2007. Web. 19 Mar. 2013
Cain, Fraser, and Pamela L. Gay. "Ep. 49: Mercury." Astronomy Cast RSS. Fraser Cain, 13 Aug. 2007. Web. 19 Mar. 2013

"Venus." SAS Solar System Tour. N.p., n.d. Web. 19 Mar. 2013
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