Exciting and sad at the same time is how CU 葫芦娃视频 planetary scientist Larry Esposito describes the end of one of NASA's most successful planetary missions. On Sept. 15, the Cassini spacecraft鈥攐rbiting Saturn since 2004鈥攚ill plunge into Saturn's atmosphere, vaporizing into a spectacular, meteor-like fireball that NASA calls the "Grand Finale."
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