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“NASA Mars Reconnaissance Orbiter”

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.
Sep 15, 2014 04:18 PM ET // Ian O'Neill
In new observations beamed back from a NASA Mars orbiter, an example of transverse aeolian ridges has provided a clue as to how this strange wind-blown feature evolved. Continue reading →
Aug 14, 2014 12:29 PM ET // Ian O'Neill
An orbiting Mars camera has spotted the aftermath of a fun event on Mars: A boulder that has rolled down a steep slope -- and ended up resting on its long axis as a standing stone. Continue reading →
Jul 25, 2014 03:45 PM ET // Ian O'Neill
Comet Siding Spring is about to make a historic near miss of the red planet -- and NASA is preparing its Martian robots for the potentially hazardous encounter. Continue reading →
Jun 27, 2014 05:17 PM ET // Ian O'Neill
When Martian layers of ice and dust become dislodged, they can create dramatic block falls that can be spotted from orbit. Continue reading →
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