Feb 14, 2003The Mars Orbital Camera captured these South Pole changes over a two year span, as entire hills and mesas reshaped and dry ice sublimed seasonally. The time-sequence shows the remarkable changing geography of a planet in flux-perhaps moving out of the last Martian Ice Age.
Jan 27, 2003The surface of Mars is scarred by ancient river valleys, apparently carved by liquid water. But was Mars warm and wet continuously for millions of years - or only temporarily when massive asteroids slammed into it? The likelihood of life on Mars may depend onDec 20, 2002Build your own virtual planet, complete with weather, habitable tropics and a tunable thermostat. In reality, changing an entire biosphere would dwarf the limits of engineers' most grand projects: Hoover Dam, Suez and Panama Canals, or hurricane cloud-seeding.Nov 19, 2002Mars may be smaller than Earth, but it's still huge to a roving spacecraft that can cover only 100 meters a day. For that reason, Mars mission planners must go to great lengths to find landing sites that might still carry evidence that life onceSep 27, 2002Five years ago today, on September 27, 1997, the Mars Pathfinder lander began to tally up its remarkable mission history. The excitement was non-stop beginning only 3 minutes after landing, when the first signals of success came back to rapt Earth-bound listeners.Aug 29, 2002University of Arkansas' researchers used a low-pressure chamber, Martian soil simulants, and an atmosphere of only hydrogen and carbon dioxide, to grow bacteria. As a Mars' simulation, the pressure is still too high by several factors, but their recipe is one step closer to an