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The Mars Exploration Rovers Update

Since 2004, original interviews, original reporting, and the only regularly published news feature documenting NASA’s first overland expedition of the Red Planet through the adventures and discoveries of Opportunity, Spirit, and the MER team, by A.J.S. Rayl. If you're new to the mission or want a list of all our resources, check out our MER mission page

Mars Exploration Rovers Update:Opportunity Climbs to Greeley Haven for Winter, and We Look Back at 2011

A.J.S. Rayl • December 31, 2011

As New Year's Eve moved from time zone to time zone across planet Earth, the Mars Exploration Rover (MER) team looked to 2012 and wrapping its eighth Earth year of exploring, while up on the Red Planet Opportunity settled into the "saddle" at Greeley Haven preparing for the onslaught of its fifth Martian winter.

Mars Exploration Rovers Special Update: Opportunity Finds Best Evidence Yet for Liquid Water in Gypsum at Homestake

A.J.S. Rayl • December 07, 2011

Mars Exploration Rover Opportunity has discovered gypsum and its "single most powerful piece of evidence for liquid water on Mars."

Mars Exploration Rovers Update:Opportunity Crunches Homestake, Scouts Locales for Winter

A.J.S. Rayl • November 30, 2011

Opportunity roved toward the end of its eighth year of exploration on the Red Planet and chalking up yet another "exciting" textbook discovery for the Mars mission.

Mars Exploration Rovers Update: Opportunity Heads for New Discovery as Winter Blows In at Cape York

A.J.S. Rayl • October 31, 2011

Opportunity roved on this month, driving alongside the rim of Endeavour Crater toward the northern end of Cape York in search of more science gold and a place to hunker down for winter.

Mars Exploration Rovers Update: Opportunity Digs In at Endeavour Crater, Team Remembers 9/11

A.J.S. Rayl • September 30, 2011

Since leaving the plains of Meridiani, pulling up to Endeavour Crater and checking out its first rock last month, Mars Exploration Rover Opportunity has wasted no time in getting the "new mission" underway.

Mars Exploration Rover Update: Opportunity Finds Martian Mystery at Endeavour Crater

A.J.S. Rayl • September 01, 2011

More than seven and a half years after landing, Opportunity arrived at its long-anticipated destination, the rim of Endeavour Crater, and in less than three weeks found something strange enough to launch a new Martian mystery.

Mars Exploration Rovers Update: Opportunity Arrives at Endeavour Crater, Mission Begins Anew

A.J.S. Rayl • August 31, 2011

The Mars Exploration Rover (MER) mission roves back into the exploration spotlight this month as Opportunity arrives at the rim of Endeavour Crater, a destination that wasn't even an impossible dream when the rover landed back in January 2004.

Mars Exploration Rovers Update: Opportunity Closes in on Endeavour as Team Bids Farewell to Spirit

A.J.S. Rayl • July 31, 2011

Opportunity seemed to sail with the wind behind her back toward the western rim of Endeavour Crater this month as the Mars Exploration Rover team shifted gears in preparation for a whole new adventure, taking time out only to bid a final farewell both privately and publicly to Spirit.

Mars Exploration Rovers Update: Opportunity Roves Back into Record Books, Spirit is Honored

A.J.S. Rayl • June 30, 2011

Opportunity 'burned up' the Meridiani Plains in June as it raced toward its much-anticipated next destination and the Mars Exploration Rover (MER) mission cruised into the 90th month of what was originally to have been a 90-day tour.

Mars Exploration Rovers Update: Spirit Mission Declared Over, Opportunity Roves Closer to Endeavour

A.J.S. Rayl • May 31, 2011

The Mars Exploration mission suffered the loss of Spirit and shifted to one-rover operations in May, but Opportunity carried on, blasting across the plains of Meridiani to within 2 miles (3.5 kilometers) of its next major destination and discovery.

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Our Mars Exploration Rovers (MER) update has recorded the journeys of the twin rovers Spirit and Opportunity on the surface of Mars since their arrival in January of 2004. It is a treasure trove of information, insight, and high-quality reporting detailing every step of this unprecedented voyage of discovery.

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