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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .If you're looking for signs of past life on Earth, some of the evidence is obvious.
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3 ."Finding a trilobite fossil is a no-brainer, we all can understand that one, or a dinosaur bone."
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4 .Jack Mustard, a Brown University geologist.
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5 .He says less obvious signs of ancient life can be found in glass.
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6 .Specifically, impact glass, which forms when asteroids slam into the planet, rapidly heating and melting the rocks around them.
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7 ."Impact glass on the Earth can preserve biological material in a kind of capsule, a time capsule if you will."
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8 .Here on Earth, for instance, scientists have found impact glass containing ancient plant matter, and other chemical signatures of life.
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9 .Jack and his colleague Kevin Cannon have now spotted the same sort of impact glass on Mars, using the spectrometer on the Mars Reconnaissance Orbiter.
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10 .Which means Martian glass might also hold evidence of life.
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11 .If the Red Planet ever harbored life, that is.
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12 .The glass is more than just a potential time capsule.
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13 .Its mineral structure also makes it an attractive snack for certain microbes.
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14 ."Microbes eat geologic materials.
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15 .But it can be a really slow process.
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16 .Glass on the other hand is something that is kinda like having a Dorito for a microbe,
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17 .because you can just start chewing away at it, and it's quite delicious, and you just munch right through it."
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18 .Meaning it also might be worth inspecting glass for anything living on it, not just trapped inside.
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19 .The findings are in the journal Geology.
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20 .So does this study suggest we should abandon the old "follow the water" mantra when looking for life?
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21 ."I certainly think it would not lend itself to, let's change the course of this ship and follow the glass.
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22 .But I think where we're at is developing significantly interesting hypotheses to explore."
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23 .And the Mars 2020 mission, which will collect samples for eventual return to Earth, might just be the perfect opportunity to start.
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24 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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