<P> NASA 's Mars Exploration Rover ( MER ) mission is an ongoing robotic space mission involving two Mars rovers , Spirit and Opportunity , exploring the planet Mars . It began in 2003 with the launch of the two rovers : MER - A Spirit and MER - B Opportunity -- to explore the Martian surface and geology ; both landed on Mars at separate locations in January 2004 . Both rovers far outlived their planned missions of 90 Martian solar days : MER - A Spirit was active until 2010 , while MER - B Opportunity is still active in 2018 , and holds the record for the longest distance driven by any off - Earth wheeled vehicle . </P>
<P> NASA 's Mars Exploration Rover ( MER ) mission is an ongoing robotic space mission involving two Mars rovers , Spirit and Opportunity , exploring the planet Mars . It began in 2003 with the launch of the two rovers : MER - A Spirit and MER - B Opportunity -- to explore the Martian surface and geology ; both landed on Mars at separate locations in January 2004 . Both rovers far outlived their planned missions of 90 Martian solar days : MER - A Spirit was active until 2010 , while MER - B Opportunity is still active in 2018 , and holds the record for the longest distance driven by any off - Earth wheeled vehicle . </P>
what are the names of the two rovers currently exploring mars
what are the names of the two rovers currently exploring mars
MER - A Spirit MER - B Opportunity
MER - A Spirit MER - B Opportunity