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Water on Mars
By Reuters -
Dark narrow streaks called recurring slope lineae emanating out of the walls of Garni crater on Mars are seen in an image produced by NASA, Jet Propulsion Laboratory (JPL) and the University of Arizona. Scientists have found the first evidence that briny water may flow on the surface of Mars during the planet's summer months, a paper published on Monday showed. REUTERS/NASA/JPL/University of Arizona 
Dark, narrow, 100 meter-long streaks on Mars inferred to have been formed by contemporary flowing water are seen in an image produced by NASA, the Jet Propulsion Laboratory (JPL) and the University of Arizona. Scientists have found the first evidence that briny water may flow on the surface of Mars during the planet's summer months, a paper published on Monday showed. REUTERS/NASA/JPL/University of Arizona
Portions of the Martian surface showing many channels from 1 meter to 10 meters wide on a scarp in the Hellas impact basin. REUTERS/NASA/JPL-Caltech/Univ. of Arizona 
Gale Crater on the planet Mars is shown in this artist's depiction. Billions of years ago, a lake once filled the 96-mile wide crater being explored by Curiosity, bolstering evidence that the planet most like Earth in the solar system was suitable for microbial life. REUTERS/NASA 
Rough spherical features in an area called Yellowknife Bay. These features are interpreted as concretions, implying they formed in water that percolated through pores in the sediment. Spherical concretions have previously been discovered in other rocks on Mars. REUTERS/NASA/JPL-Caltech/MSSS 
Curiosity appears as a bluish dot near the lower right corner of this enhanced-color view from Orbiter taken on June 27, 2013. REUTERS/NASA/JPL-Caltech/Univ. of Arizona 
The surface of the planet Mars inside Gale Crater. REUTERS/NASA 
In this image taken by Curiosity's Mast Camera, the Alpha Particle X-Ray Spectrometer is pictured, with the Martian landscape in the background, Scientists enhanced the color in this version to show the Martian scene as it would appear under the lighting conditions we have on Earth, which helps in analyzing the terrain. REUTERS/NASA/JPL-Caltech/MSSS 
A rock outcrop called Link pops out from a Martian surface. Rounded gravel fragments, or clasts, up to a couple inches in size are in a matrix of white material. The outcrop characteristics are consistent with a sedimentary conglomerate, or a rock that was formed by the deposition of water and is composed of many smaller rounded rocks cemented together. Scientists enhanced the color in this version to show the Martian scene as it would appear under the lighting conditions we have on Earth. REUTERS/NASA/JPL-Caltech/MSSS 
Part of the wall of Gale Crater. Here, a network of valleys believed to have formed by water erosion enters Gale Crater from the outside. REUTERS/NASA/JPL-Caltech/MSSS 
The Hubble Space Telescope snapped this portrait of Mars within minutes of the planet's closest approach to Earth in nearly 60,000 years on August 27, 2003. REUTERS/NASA 
The northern-most sand dunes are seen as they begin to emerge from their winter cover of seasonal carbon dioxide (dry) ice in this image acquired on January 16, 2014. REUTERS/NASA/JPL-Caltech/Univ. of Arizona 
A view of the Noctis Labyrinthus region of Mars, perched high on the Tharsis rise in the upper reaches of the Valles Marineris canyon system. REUTERS/NASA/JPL/University of Arizona 
This self-portrait of Curiosity rover is shown in this composite image released May 30, 2013. REUTERS/NASA 
Inclined layering known as cross-bedding in an outcrop called Shaler on a scale of a few tenths of a meter in an image taken January 2013. REUTERS/NASA/JPL-Caltech/MSSS 
The top of a rock called Bathurst Inlet. REUTERS/NASA 
The Martian horizon seen by a camera onboard Curiosity in August 2012. REUTERS/NASA 
A cliff, up to 4,000 m high, located in the eastern part of Echus Chasma. REUTERS/ESA/DLR/FU Berlin/G.Neukum 
Two trenches dug by Phoenix's Robotic Arm in June 2008. REUTERS/NASA/JPL-Caltech/University of Arizona/Texas A&M University 
Mars' Victoria Crater at Meridiani Planum. REUTERS/NASA/JPL/Caltech 
Echus Chasma is an approximately 100 km long and 10 km wide incision in the Lunae Planum high plateau north of Valles Marineris, the Grand Canyon of Mars. Images taken by ESA's Mars Express of Echus Chasma in July 2008. REUTERS/ESA/DLR/FU Berlin/G.Neukum 
Rocky cliffs in the foreground named Cape Verde are seen in this image taken by Mars Exploration rover in 2006. REUTERS/NASA-JPL 
This image, cropped from a larger panoramic image mosaic taken by the Mars Exploration Rover Spirit panoramic camera, released in March 2004, shows the rover's destination toward the hills nicknamed the Columbia Hills. REUTERS/NASA/JPLCornell/USGS 
An iron meteorite on Mars in an image taken by the Mars Exploration Rover Opportunity in January 2005. REUTERS/NASA/JPL/Cornell 
A high-resolution image, using data from the NASA Mars Exploration Rover Opportunity's panoramic camera's near-infrared, blue and green filters combined to create an approximate true-color image, of a puzzling rock outcropping to the northwest of the rover. Image taken January 2004. REUTERS/HO/NASA/JPL/Cornell 
A computer-generated image depicting part of Mars at the boundary between darkness and daylight, with an area including Gale Crater, beginning to catch morning light. Image released August 2011. REUTERS/NASA/JPL-Caltech 
A portion of the west rim of Endeavour crater sweeps southward in this color view from NASA's Mars Exploration Rover Opportunity released in August 2011. REUTERS/NASA/JPL-Caltech/Cornell/ASU