If life exists on Mars, it’s likely hiding — or maybe sleeping
With the latest detection of organic compounds by the Curiosity rover, the case for past life on Mars becomes stronger than ever, as suggested in a recent paper by Alexander Pavlov in the journal Astrobiology. And that lends additional credence to an even more exciting idea — that living organisms may still exist on Mars today. If that’s true, what form should we expect them to take? And where should we search for them? The planet’s surface is a brutal environment for any known type of organism, with huge temperature swings (from approximately -150 °C to 25 °C), virtually no water, and high doses of radiation. Yet we know from our own planet how resilient and adaptive life can be. Besides, this hostile environment didn’t always exist on Mars. So if life once thrived on the Red Planet, where did it go? Option 1: Retreat! We know from half a century of robotic Mars exploration that the planet once had watery environments similar to those on Earth’s surface, probably including shallow lakes, streams, and deeper-water …








