Curiosity finds organics on Mars, but possibly not of Mars
A chance comment to a journalist by Grotzinger last month caused a welter of speculation that native organic compounds had been found. Such was the fuss that NASA was forced to release a statement denying this, and Grotzinger said that the overall enthusiasm of the science team at getting good baseline sampling of Martian soil was the cause for the initial excitement.
“What I’ve learned from this is that you have to be more careful about what you say and how you say it,” Grotzinger told the assembled press on Monday. “We’re doing science at the speed of science and the world’s moving at the speed of an Instagram.”
Although there’s no definitive proof of homegrown Martian organics, the analysis so far does pose some interesting questions. For example, the water samples tested shows that Martian water has five times the level of deuterium – a heavy hydrogen isotope – than is found in seawater here on Earth. This could be because the Marian atmosphere is losing lighter isotopes, something the MAVEN probe will test when it gets to Mars orbit in 2014.
The soil sampling so far has also shown that Curiosity’s instruments are functioning normally and have been testing base Martian material, since a close correlation has been found between soil the rover has sampled and that tested by its predecessors Spirit and Opportunity. Ralf Gellert, principal investigator of Curiosity’s Alpha Particle X-Ray Spectrometer, said this was in part deliberate to try and find what the everyday surface of the Red Planet was made of.
There was some understandable disappointment among the assembled press at Monday’s conference, including with this hack. But we really should get over ourselves and remember that this entire mission is historic. NASA has lowered a nuclear-powered, laser-wielding, 1.5-ton rover onto the Martian surface using a delicate hovering-rocket descent stage, a rolling laboratory that should provide years of useful science.
The fact we can’t get a quick fix of results says a lot about the strengths of NASA’s careful scientific methodology, and a lot more about humanity’s weakness for a good story.