“NASA released Thursday an image of a comet that, on Oct. 19, will pass within 84,000 miles of Mars — less than half the distance between Earth and our moon.
The image on the left, captured March 11 by NASA’s Hubble Space Telescope, shows comet C/2013 A1, also called Siding Spring, at a distance of 353 million miles from Earth. Hubble can’t see Siding Spring’s icy nucleus because of its diminutive size. The nucleus is surrounded by a glowing dust cloud, or COMA, that measures roughly 12,000 miles across.”
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Sandstone layers with varying resistance to erosion are evident in this Martian scene recorded by the Mast Camera on NASA’s Curiosity Mars rover on Feb. 25, 2014, about one-quarter mile (about 400 meters) from a planned waypoint called “the Kimberley.” Image Credit: NASA/JPL-Caltech/MSSS
NASA article link: http://mobile.nasa.gov/jpl/msl/curiosity-20140324 via #NASA_APP
“Variations in the stuff that cements grains together in sandstone have shaped the landscape surrounding NASA’s Curiosity Mars rover and could be a study topic at the mission’s next science waypoint.
On a journey with many months yet to go toward prime destinations on the lower slope of Mount Sharp, Curiosity is approaching a site called “the Kimberley.” Scientists on the team picked this location last year as a likely place to pause for investigation. Its informal name comes from a northwestern Australia region known as the Kimberley. The Martian site’s geological appeal, based on images taken from orbit, is that four types of terrain with different rock textures intersect there.”