Microbes could survive on Mars despite its harsh environment, a year-long experiment conducted by a team of astrobiologists from the University of Arkansas in Fayetteville has proven. Sure, that's a little less exciting than proving that little green men could have lived on the red planet. But it still brings up the possibility that there may have been life on Mars at one point, no matter how small. The scientists were compelled to conduct a study when Curiosity detected the presence of methane. Most of the methane on Earth is produced by living organisms, and team leader Rebecca Mickol said the "the same could possibly be true for Mars."