Astronomer Dr. Mark Hammergren on the Cassini Spacecraft

Roe Conn

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)

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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.

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