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John Spencer

03/31/2008 | 0:28:52
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Flying Through the Geysers of Enceladus

Posted 2009/06/09 11:03 CDT | 0 comments

Mysteries, Small and Large

Posted 2009/06/08 01:49 CDT | 0 comments

Taking a look at Jupiter's moon, Io, from Hawaii.

Posted 2009/02/24 02:58 CST | 0 comments

John Spencer: Cassini's proposed extended-extended mission tour

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