A study has shown that if our rovers are looking for life, they should look for a very specific type of rock. It's so interesting that rocks that are shaped like fettuccine noodles are shaped that way because they've encountered bacteria, which, of course, points toward life existing somewhere at some point!
Bacteria contributes to the shaping of these rocks, and scientists think that it's possible to have the same effect on Mars, considering how similar the planet is to Earth in some ways. We'll have a 2020 rover heading to the Red Planet next, so maybe with these parameters set it will find more evidence of life.
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