Streamed live on Sep 28, 2015

Original air date: Sept. 28, 2015 at 8:30 a.m. PT (11:30 a.m. ET, 1530 UTC)

New findings from NASA's Mars Reconnaissance Orbiter (MRO) provide the strongest evidence yet that liquid water flows intermittently on present-day Mars. News conference participants were:

-- Jim Green, director of planetary science at NASA Headquarters
-- Michael Meyer, lead scientist, Mars Exploration Program, NASA
-- Lujendra Ojha, Georgia Institute of Technology, Atlanta
-- Mary Beth Wilhelm, NASA's Ames Research Center, Moffett Field, California and Georgia Tech
-- Alfred McEwen, principal investigator, HiRISE, University of Arizona in Tucson