Thursday, May 28, 1998 Published at 16:47 GMT 17:47 UK
Mineral 'reveals' mysteries of red planet
The red planet could have once sustained life
Scientists believe they have discovered evidence that shows Mars could have once had water, a key element to sustain life.
A Martian mineral deposit 300 miles wide has led to speculation that there was water on Mars long enough for life to form.
Professor Phil Christensen of Arizona State University said that the deposit "is really the first evidence we have that hot water was around long enough for a geological period of time so that potentially life could have had an opportunity to form."
The deposit, hematite, is an iron oxide mineral that forms by a variety of ways that often involve water.
The coarse-grained hematite spotted on Mars occurs on this planet around volcanic regions on this planet.
Scientists working on the Mars Global Surveyor Mission said the find is evidence that a large scale hydrothermal system operated beneath the Martian surface.
Professor Christensen said: "If you want to find out about possible life on Mars, the deposit is a good place to start.
"You've got water, you've got heat, got energy. It's a good place if you want to have life."
The instrument also revealed the presence of high altitude clouds above the polar cap.
A composite photograph of a crater 25 miles wide and one mile deep about 3,600 miles south of the Martian equator was also displayed.
The deep, dark area near the middle of the crater appeared to be a frozen pond and there was evidence of seepage as well, Smith said.
"It's like a dry lake," he said.
The scientists are trying to determine what Mars was like three billion years ago and that is where the evidence of water and mineral deposits come into play.