NASA’s Mars Curiosity Rover on Monday announced big news from the results of its first global soil sample analysis (soil representative of the entire Red Planet): It’s found chlorinated methane compounds, molecules containing carbon, a necessary tell-tale sign and byproduct of life. The problem is, NASA still isn’t sure whether the carbon has come from Mars, outer space, or Earth itself.
This is a companion discussion topic for the original entry at https://talkingpointsmemo.com/?p=93451