Listen: Bill Leff and Judy Pielach Bonus Hour

Astronomer Dr. Mark Hammergren on the Cassini Spacecraft

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This July 23, 2008 image made available by NASA shows the planet Saturn, as seen from the Cassini spacecraft. After a 20-year voyage, Cassini plunged into Saturn on Friday, Sept. 15, 2017. (NASA/JPL/Space Science Institute via AP)

Dr. Mark Hammergren, Astronomer for the Adler Planetarium joins Roe and Anna to talk about the Cassini Spacecraft and its final moments before crashing into Saturn.