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By Jamie Leventhal
The American space agency plans to announce details of the new expedition from its headquarters on Thursday.
By Nsikan Akpan
The death of NASA's Cassini spacecraft is a matter of life or… well…life.
By Fedor Kossakovski
Researchers have spotted a liquid lake on Saturn's moon Titan, making that moon the first celestial body shown to have fluid on its surface. But this isn't a lake you'd want to swim in -- it's made up of ethane,…
By PBS NewsHour
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