There are several reasons why scientists have thought Mars may not be able to support life. For starters, its surface is extremely cold and too low-pressure to sustain liquid water. But did you know that the caves just underneath the planet's exterior help Mars offer more inhabitable space than Earth?
According to Mashable, "fully 3% of Mars has the right conditions to support life, the researchers say." And while that might not sound like an impressive number, it's more than that of Earth where only 1% of the planet's volume is able to support life.
Just underneath Mars' surface, it's "warm and pressurized enough for life to live." Scientists predict that if life does exist on Mars, it's mostly microbes. But what if there's something more? Next August, NASA's Curiosity Rover will arrive on Mars to explore and examine sediment. Perhaps it will stumble upon little green men walking their little green dogs with promotional pet products!
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