NASA just schooled actor Milo Ventimiglia‏ about space because Twitter

Who knew that teaching actors about space science was part of NASA's mandate? 
Milo Ventimiglia — who plays Jack in This is Us and Jess on Gilmore Girls — begged NASA via Twitter on Monday to keep the Cassini spacecraft "alive" in orbit around Saturn. And, because Twitter is the great equalizer, of course the space agency replied. 
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NASA's official Cassini account explained tha