22 年前
视频简介
An in-depth look at the Democratic and Republican national conventions held during the 2008 U.S. Presidential election year.。The Cassini spacecraft was sent on its way to Saturn in 1997. Since then, she has travelled nearly four billion kilometers, delivered a probe to a toxic moon, discovered phantasmagorical structures on the planet's icy rings, studied the startling atmosphere on a tiny moon. Now, on a daring spiral orbit, Cassini will streak toward Saturn itself, streaming data to Earth before be...。
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