[X] My Assistant

[Redstone]

Another interesting fact sheet on an MSL instrument. This one achieves remote sensing (up to 13 meters away) of elemental abundances by firing a laser and and performing spectrographic analysis of the resultant flash. Another part of the instrument is a Remote Micro Imager, which gives resolution approaching the MER MI, but at a range of 2 meters rather than 6 cm.

Apart from great opportunities for rapid science return, this instrument also has a significant coolness factor. I mean, a rover with a laser that zaps rocks! If that doesn't capture the public's imagination, I wonder what will?

Also: a new article on MSL and ChemCam from Astrobio.net. According to the article the Double and Delay option for MSL is still being considered. Anyone know when NASA will/must make a decision?

[Guest_BruceMoomaw_*]

There's another good reason not to launch both MSLs simultaneously -- the basic scientific purpose of repeat MSLs. Although this hasn't gotten as much publicity as it deserves, it was made clear to the Mars Strategic Roadmap Committee that MSL is actually yet another "reconaissance" mission of Mars -- its main purpose is to locate a place on Mars that has trace organic compounds, so that we can use the same spot as the site for the first Mars sample return mission. (Since the latter will cost several billion dollars a pop, we most definitely want to pick out the best possible scientific landing spot for it.) But if the first MSL fails to turn up organics, we would be up the creek when it comes to knowing where to send the sample-return mission (or even the possible cheaper alternative of an "Astrobiology Field Lab" rover carrying instruments for much more detailed in-situ analysis of the organics found by MSL) -- unless we fly another MSL (or even a third one, if necessary) that DOES locate such organics.

For the same reason, the science results from the first MSL are likely to be important in selecting the best landing site for the second MSL. The possibility can't even be ruled out that if the first MSL finds really promising organic evidence, we'll simply skip MSL-2 for now to save money and start focusing entirely on developing and flying the sample-return mission to the MSL-1 site as soon as possible. And if we do fly MSL-2, it may well not fly until 2013, to allow proper time in picking the best landing site (and instruments) for it. I keep quoting Gollum to describe the best Mars exploration strategy: "Cautious, my Precious! More haste less speed!"

[Marcel]

There's another good reason not to launch both MSLs simultaneously -- the basic scientific purpose of repeat MSLs.  Although this hasn't gotten as much publicity as it deserves, it was made clear to the Mars Strategic Roadmap Committee that MSL is actually yet another "reconaissance" mission of Mars -- its main purpose is to locate a place on Mars that has trace organic compounds, so that we can use the same spot as the site for the first Mars sample return mission.  (Since the latter will cost several billion dollars a pop, we most definitely want to pick out the best possible scientific landing spot for it.)  But if the first MSL fails to turn up organics, we would be up the creek when it comes to knowing where to send the sample-return mission (or even the possible cheaper alternative of an "Astrobiology Field Lab" rover carrying instruments for much more detailed in-situ analysis of the organics found by MSL) -- unless we fly another MSL (or even a third one, if necessary) that DOES locate such organics.

For the same reason, the science results from the first MSL are likely to be important in selecting the best landing site for the second MSL.  The possibility can't even be ruled out that if the first MSL finds really promising organic evidence, we'll simply skip MSL-2 for now to save money and start focusing entirely on developing and flying the sample-return mission to the MSL-1 site as soon as possible.  And if we do fly MSL-2, it may well not fly until 2013, to allow proper time in picking the best landing site (and instruments) for it.  I keep quoting Gollum to describe the best Mars exploration strategy: "Cautious, my Precious!  More haste less speed!"

To be honest, I don't understand how NOT finding any organics by the first MSL can improve the chance for MSL 2 to do so. In other words: if MSL 1 does not give us data that wants us to go there again to get samples to bring to earth, then what data can it provide us in order to let MSL 2 land on a location more likely to actually have organics ? Can you explain what you mend by "likely to be important in selecting the best landing site for the second "?