"We have the same laws of chemistry, physics. If there are any locations where there are the basic ingredients, there should be the basic ingredients for life."
Charles Elachi, Director of the NASA Jet Propulsion Lab at Caltech, doesn't hesitate when he's asked about life beyond earth. "Personally, I think absolutely," he said today at The Atlantic's Big Science Summit in San Jose, California. "We have the same laws of chemistry, physics. If there are any locations where there are the basic ingredients, there should be the basic ingredients for life."
One ingredient, of course, is water. On Mars, images from orbit show what looks like dried up drainage channels. Elachi compares them to the patterns you can see as you fly over Egypt's desert -- an imprint that marks where water once was. The Mars rovers Spirit and Opportunity found other hints of water on Mars as well. "We found rocks that have been modified by the presence of water," he said.
It would be ideal, of course, if NASA's newest arrival on Mars, the Curiosity rover, were to stumble upon a fossil. But absent that, NASA will continue gathering data, looking for signs of that something might have lived 127 million miles away. Much of the intense interest, says Elachi, spring from the similarities between Earth and Mars. "They have similar initial conditions. One went this way and and the other went that way. How did life start on this planet [Mars] and somehow stop? Or it never started?"
There's still a lot to learn. Elachi is thinking beyond even Curiosity to the work that could be done on Mars over the next decade. With the right amount of money and attention, Elachi believes, flying and driving robots could have a continuous presence on the planet.
He also believes a trip to Jupiter's moon Europa is possible in the next decade. Europa contains an ocean larger than the Earth's under its icy surface. Perhaps there, beneath the ice, NASA could find the smoking gun of life beyond Earth.
We want to hear what you think about this article. Submit a letter to the editor or write to firstname.lastname@example.org.