NASA Television will live broadcast a discussion Wednesday, Aug. 20, from 5:30 to 6:30 p.m. EDT, with leading science experts describing what is known about our ancient Earth and how that information can guide the search for habitable planets orbiting other stars.

The event, which will take place in the Webb Auditorium at NASA Headquarters, 300 E Street SW in Washington, is open to the public.

Participants in the discussion include:

- Phoebe Cohen, Professor of Geosciences Williams College, Williamstown, Massachusetts.

- Shawn Domagal-Goldman, research space scientist, NASA’s Goddard Space Flight Center, Greenbelt. Maryland.

- Christopher House, Professor of Geosciences, Pennsylvania State University, University Park, Pennsylvania.

- Timothy Lyons, Professor of Biogeochemistry, UC Riverside, Riverside, California.

- Dawn Sumner, Professor of Geology, UC Davis, Davis, California.

- David Grinspoon, senior scientist, Planetary Science Institute, Tucson, Ariz. and former Blumberg NASA-Library of Congress Chair in Astrobiology, Washington

Questions can be asked during the event by attendees or via Twitter using the hashtag #AskNASA.

For NASA TV streaming video, schedules and downlink information, visit:

http://www.nasa.gov/nasatv

For more information about NASA's astrobiology activities, visit:

http://www.astrobiology.nasa.gov

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