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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 Family Portrait

Emily Lakdawalla • November 23, 2011

Jason Davis put together this neat summary of the checkered history of Mars exploration.

Curiosity in context: Not exactly "Viking on wheels," but close

Emily Lakdawalla • November 21, 2011

As I was beginning my research for my two magazine articles on the Curiosity rover's upcoming mission to Mars, I needed to figure out for myself how exactly this gigantic, ungainly machine fit in to the context of past Martian missions.

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.

The latest HiRISE view of Opportunity, on Endeavour's rim

Emily Lakdawalla • September 24, 2011

In a now-routine act of obtaining detailed photographs of robots from Earth sitting on the surface of another planet, the HiRISE camera on Mars Reconnaissance Orbiter has captured a view of Opportunity sitting on the rim of Endeavour crater.

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.

In their own words

Emily Lakdawalla • August 16, 2011

While doing my daily reading today I was struck by the awesomeness of two recent blog posts. Both were composed not by professional bloggers like me but by professional space explorers, one a scientist and the other an engineer.

Wheels on Cape York!

Emily Lakdawalla • August 10, 2011

Opportunity's wheels are on a whole new different kind of rock: she has arrived at the rim of Endeavour crater, on Cape York.

Spirit Point and Odyssey crater in sight, and new rock under Opportunity's wheels

Emily Lakdawalla • August 07, 2011

Opportunity is at her goal. In this 3D anaglyph, taken on sol 2678 (yesterday, August 6, 2011), Opportunity's wheels are resting on strange lumpy bedrock.

Mountains rising for Opportunity

Emily Lakdawalla • July 31, 2011

The views from Opportunity of Endeavour's near and distant rim peaks are getting ever more vertical as Opportunity approaches Cape York.

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.

Opportunity's horizon rises -- and maybe brings Cape York into view

Emily Lakdawalla • July 21, 2011

For miles and miles of Martian terrain, Opportunity's view forward has contained a distinctive line of hills—the far rim of Endeavour crater.

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.

In Memory of Spirit, and Why Cuteness Matters

Melissa Rice • June 15, 2011

An analysis of "cuteness," and why it matters when talking about science.

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.

Mars Exploration Rovers Update: NASA Ends Spirit Mission

A.J.S. Rayl • May 26, 2011

The intensified effort to recover Mars Exploration Rover (MER) Spirit came to an end early Wednesday morning Pacific time and NASA has now transitioned the mission to a single-rover operation focused on Spirit's still-active twin, Opportunity.

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