The panel of biochemists, planetary scientists, geneticists and other experts considered all possible ways life can arise and exist.Recent discoveries of extremophiles-organisms living in conditions of heat, cold and dark and using chemicals once thought incompatible with life-have changed ideas of where life can survive.Prof Baross said lab experiments also showed water did not necessarily have to be the basis for life. It might be possible for a living organism to use methane, ethane, ammonia or even more bizarre chemicals."We had some discussion about how weird to make this because there are so many concepts out here."There are so many theories about what life is and what could be a living system."NASA and other groups are looking hard for extraterrestrial life. Telescopes search for spectral signatures from other planets that might suggest water is on the surface. Robots on Mars are seeking evidence of water, past or present.
"We wanted to actually think outside of that box a little bit and at least try to articulate some of the other possibilities besides water-carbon life."They suggested NASA should return to some of the more promising places in our own solar system to look for evidence of life, such as Saturn's moons Titan and Enceladus, and even steamy Venus.
As in the days of Noah...