| Phoenix Lander Touches Down Near Mars's North Pole (May 25, 2008)|
The craft is now the first to successfully land near a Martian pole and should soon begin collecting samples to determine whether the red planet was once habitable.
| Early Mars Had Floods, Yellowstone-Like Hot Springs (May 22, 2008)|
The formation of an Idaho canyon thousands of years ago, along with recent discoveries of ancient hot springs and geysers on Mars, has given scientists a clearer picture of how water sculpted the surface of the red planet.
| Any Possible Mars Water or Life Is Deep Below Surface (May 15, 2008)|
Mars's ice caps are about five million years old, and its bedrock is puzzlingly cold and thick, reducing the boundary where liquid water may have formed.
| Hundreds of Salt Deposits Spotted on Mars (March 20, 2008)|
The first evidence of chloride minerals on the red planet could lend new vigor to the search for salt-loving life on Mars, a new study says.
| Melting Snow Created Mars Gullies, Expert Says (March 19, 2008)|
Features on Mars that appear to have been carved by fluid were most likely created when recurring climate changes caused snow to fall and then melt.
| River-Size "Flash Floods" May Have Carved Mars Craters (February 20, 2008)|
Puzzling terraced craters may have been carved into by short-lived flows of water the size of the Mississippi or Rhine Rivers, a new study says.
| Early Mars Too Acidic, Salty for Life, Experts Say (February 17, 2008)|
Early Mars was probably a wet world but not a habitable one because of high concentrations of dissolved minerals, scientists have announced.
| Alien Life May Be "Weirder" Than Scientists Think, Report Says (July 6, 2007)|
Scientists need to rethink what constitutes life in their search for ETs and seek out so-called weird life-forms that could thrive in extreme environments, a new report says.
| Mars Once Had Oceans, New Evidence Suggests (June 13, 2007)|
A large basin on Mars's northern plains really did once hold a giant ocean, suggests new research into the planet's shifting poles.
| Mars Rovers Find "Best Evidence Yet" of Water (May 23, 2007)|
An accidental skid by the Mars rover Spirit turned up what experts say is proof that the red planet was once quite wet.
| Mars's Ice Patchy, Water Cycle Quite Active, Study Reveals (May 2, 2007)|
Detailed new scans show that the depth of the red planet's underground ice layer is extremely variable, coming within an inch (2.5 centimeters) of the surface in some places.
| Mars Water Traces Left by Springs, Not Seas, Experts Say (March 7, 2007)|
Curious deposits on Mars that originally appeared to be signs of an ancient ocean were instead produced by water emerging from underground, a new study finds.
| New Mars Pictures Show Signs of Watery "Aquifers" (February 16, 2007)|
Stunning color images offer new evidence that plentiful water once percolated through Martian bedrock—and new hints as to where life might be hiding.
| Mars Life May Be Too Deep to Find, Experts Conclude (February 2, 2007)|
If life as we know it exists on the red planet, it would have to be deeper under the surface than current probes are able to detect, a European team concludes.
| Mars's Water Could Be Below Surface, Experts Say (January 25, 2007)|
Mars may still house large reservoirs of the water and carbon dioxide that once formed the planets ancient atmosphere, new research suggests.
| Mars Scientists Intensify Search for Water (December 15, 2006)|
Spurred on by new evidence of water, experts announced plans to use powerful cameras to seek rock-solid proof that the liquid hasn't stopped flowing on Mars.
| Mars Has Liquid Water, New Photos Suggest (December 6, 2006)|
NASA released images today that reveal water likely flowed through Martian gullies within the past few years, providing a "squirting gun" of liquid water's presence on the red planet.
| Viking Mission May Have Missed Mars Life, Study Finds (October 23, 2006)|
The Viking landers may have missed signs of life on Mars in 1976, according to new research, leading scientists to call for amped-up technology on future missions.
| Mars's Peroxide Snow Would Kill Any Surface Life (August 7, 2006)|
Dust devils on the red planet help spin off poison precipitation that makes life on the surface impossible, scientists say.
| Young Mars Was Wet, Mineral Map Shows (April 20, 2006)|
Mars was once wet, many scientists say. Now it's dry. For the first time, a geological map of the entire planet is revealing the history of its dessication.
| Lunar Photos Cast Doubt on Recent Mars Water, Astronomers Say (March 21, 2006)|
Scientists studying Martian formations that suggest water recently flowed on the red planet might have to curb their enthusiasm—reexamination of lunar photos from 1969 shows similar features on the moon.
| THOR Spacecraft to Hammer Out Huge Crater on Mars (January 30, 2006)|
NASA's THOR mission may blast an enormous crater on Mars in the hopes of unearthing evidence of water-ice in the red planet's potentially habitable zones.
| Does Mars Methane Indicate Life Underground? (October 7, 2004)|
New methane readings from a space probe raise the possibility that microbial life could exist on Mars. Some scientists, though, remain skeptical.
| Mars Had Ocean, Controversial New Theory Says (September 22, 2004)|
A controversial new study suggests Mars had an acidic ocean. The strange brew, spiked with sulfates and iron, could still have harbored life, scientists say.