July 20, 1976: Landing on the red planet

#OTD in 1994, the launch of Columbia on the STS-62 microgravity research mission

Researchers using data from a NASA satellite orbiting Mars said Monday they have found clear evidence of intermittent flows of salty water on the red planet, the first “unambiguous” signs of liquid water on the frigid world and a possible indicator of microbe-friendly environments below the surface.

SpaceX chief executive Elon Musk will unveil his plans for human missions to Mars on Tuesday in a presentation at the International Astronautical Congress in Guadalajara, Mexico. Watch the speech live at 2:30 p.m. EDT (1830 GMT).