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“NASA Mars Reconnaissance Orbiter”

Jan 25, 2015 03:07 PM ET // Jason Major
Here today, gone tomorrow; a bright layer of frost lining a crater wall is vanquished by the springtime sun -- and seen by a NASA Mars satellite high overhead.
Dec 29, 2014 12:38 PM ET // Ian O'Neill
The Martian surface is covered with a diverse array of landscapes and features, but this is one of the weirdest.
Dec 24, 2014 12:43 PM ET // Ian O'Neill
Although this crater rim is entering summer, its south-facing slopes are still festively frosted in ice.
Dec 8, 2014 01:20 PM ET // Ian O'Neill
The Martian landscape is peppered with features that look very alien and often cannot be easily explained.
Oct 20, 2014 11:35 AM ET // Ian O'Neill
As comet Siding Spring speeds away after its Martian encounter on Sunday, our armada of satellites have reported in to signal that they are OK.
Oct 20, 2014 08:50 PM ET // Ian O'Neill
The HiRISE camera on board NASA's Mars Reconnaissance Orbiter (MRO) has become the first instrument orbiting Mars to beam back images of comet Siding Spring's nucleus and coma. Continue reading →
Oct 17, 2014 02:05 PM ET // Ian O'Neill
Comet Siding Spring will make a heart-stopping close flyby of the Red Planet in Sunday, giving our Martian armada of robotic explorers a ring-side view of the spectacle. Continue reading →
Oct 10, 2014 01:00 PM ET // Mike Wall, Space.com
A comet will give Mars a historically close shave next weekend, and NASA aims to be ready for the dramatic cosmic event.
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