These impact glasses are thus an important target to search for signs of ancient life on Mars, but until now they have not been definitively detected on the martian surface. In this study, Kevin Cannon and John Mustard used orbital remotely sensed data to investigate spectral signatures of geologic units on Mars that were formed during impacts (impactites).Using spectral mixture modeling, they found that glass is in fact present in these units, mixed with other minerals like olivine and pyroxene. This modeling approach allows for the identification glass signatures that are not otherwise obvious when glass is present in a mixture.The glass rich impactites Cannon and Mustard have identified have been preserved on billion year timescales, old enough to date back to more clement surface conditions on Mars.
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