Chat with planetary geologist Emily Martin as we celebrate the Cassini–Huygens mission to Saturn, which ends on September 15th. Ask questions about the mission, Saturn and its moons, and what it is like to be a planetary geologist. Emily Martin is a planetary geologist at the National Air and Space Museum's Center for Earth and Planetary Studies.

In the event of inclement weather, the program may be moved or postponed. Check @SIObservatory for updates or call (202) 633-2517.

Accessibility: The Observatory dome and Museum galleries are accessible.