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For more information, see TIME ONLINE's Life on Mars Website at time.com/mars
At the Johnson Space Center, meanwhile, researchers are back at their instruments, gathering ammunition for what could be a long battle with their critics in the scientific community. "We feel we can already see a cell wall," says NASA's Gibson hopefully. NASA administrators were also busy, re-examining their...
Did life emerge spontaneously on earth, or did it come from outer space? The scientific community is sharply split on the question, and the evidence from Mars not only heats up the debate but also adds a tantalizing third possibility: life-forms may have arisen on Mars first and then...
Sound implausible? Consider the alternatives. Sir Fred Hoyle, the distinguished British astronomer, favors an even more radical theory. The idea, known as panspermia, is that billions of years ago, the solar system was peppered by biological "seeds," which took root wherever conditions were right. That would explain how life may...
What about the idea that Mars seeded Earth? Recent findings suggest there could have been substantial biological exchange between the planets. Every year, researchers calculate, two tons of Martian material rain down on Earth, and two tons of terrestrial rock smash into Mars. The chances that a primitive creature secreted...