If intelligent life forms exist beyond Earth, they likely know we’re here, a NASA official said Tuesday at the Astrobiology Science Conference in Chicago.

Scientists have discovered methane hidden in Martian meteorites, which could hint that the elusive gas, which on Earth is often linked to life, might be lurking beneath the surface of Mars today.

“So while we cannot say that this discovery is proof of the existence of life on Mars, it gives strong encouragement to continue looking for methane sources that could support life”. Based on the Sun’s correlation with Mar’s tilt, a cold and icy Red Planet with temperatures of negative 54 degrees Fahrenheit seemed to make the most sense. Methane can also be consumed by certain types of microbes, so the presence of methane could potentially be a food source for them.

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