Venus, Mars ...

25 Jun 2010

www.physorg.com/print196587370.html asks, Was Venus once a habitable planet? Did it once have an ocean? This is an exercise in computer modellingt - read with a beady eye.

Meanwhile, a NASA news release at www.jpl.nasa.gov/news on June 24th says that new clues indicate there was a wet era on Mars that was global in extent, quoting a paper from Science from the last week in June. The Mars Reconnaisse Orbiter checked out 91 craters and the northern zone and in 9 of them found clays and clay like minerals, such as phyllosilicates, that form in wet environments.