Space scientists won't say so, but the results of three brilliantly conceived experiments lead inevitably to one startling conclusion: Life, in some form, exists on Mars.
The idea that Mars, like the earth, might be the home of living beings has held our imagination since the turn of the century, when Percival Lowell thought he saw hundreds of canals crisscrossing the face of the planet, and took them as proof that Mars was inhabited.
Lowell was wrong. The canals never existed, as Mariner 9 photographs finally proved five years ago. But even though his evidence was mistaken, Lowell's conclusion may yet be vindicated: the Viking landers have returned an impressive array of biochemical data which seems to show that some form of life really does exist on Mars.
The results of the Viking life-detection experiments have been more positive than most people expected. Dr. Robert Jastrow, director of NASA's Goddard Institute for Space Studies, says, "Short of seeing something wiggling on the end of a pin, the case for life on Mars is now as complete as the Viking experiments could make it."