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Until now, the question of liquid water has focused on ancient Mars, and on the Martian north pole, where water ice has been detected. Scientists have long noted Martian features that appear to have been scoured by water or look like shorelines, and have tried to prove that the Red Planet had liquid water eons ago.
NASA photographs have revealed bright new deposits seen in two gullies on Mars that suggest water carried sediment through them sometime during the past seven years.
"These observations give the strongest evidence to date that water still flows occasionally on the surface of Mars," said Michael Meyer, lead scientist for NASA's Mars Exploration Program, Washington.
A provocative new study of photographs taken from orbit suggests that liquid water flowed on the surface of Mars as recently as several years ago...
Figure D: To confirm that the new, light-toned gully deposit is not just a trick of changing illumination conditions as the sun rises to different levels in the sky each season, the Mars Orbiter Camera team repeatedly imaged this site throughout 2005 and 2006. Four examples are shown here, acquired in April 2005, August 2005, February 2006 and April 2006. The "i=" indicates solar-incidence angle, or the height of the sun in the local sky, relative to a case where the sun would be directly overhead (i=0 degrees). Thus, the higher the incidence angle, the lower the sun would appear in the sky to an observer on the ground.
Originally posted by Jbird
Looks like they have that angle , somewhat covered, Fiverz.
Originally posted by Rasobasi420
Since there is no precipitation on mars (right?) it must have come from an underground resevoir. Is that resevoir frozen, or is it liquid?
The temperature at the planet's surface varies widely during the course of a Martian day, from about 186 K (-87 °C) just before dawn to about 253 K (-20 °C) in the afternoon.
The melting point of water at 1 atmosphere of pressure is 0 °C (32 °F, 273.15 K), this is also known as the ice point. In the presence of nucleating substances the freezing point of water is the same as the melting point, but in the absence of nucleators water can supercool to −42 °C (−43.6 °F, 231 K) before freezing.