<P> Opportunity , also known as MER - B ( Mars Exploration Rover -- B) or MER - 1 , is a robotic rover active on Mars since 2004 . Launched on July 7 , 2003 as part of NASA 's Mars Exploration Rover program , it landed in Meridiani Planum on January 25 , 2004 , three weeks after its twin Spirit ( MER - A ) touched down on the other side of the planet . With a planned 90 sol duration of activity ( slightly more than 90 earth days ) , Spirit functioned until getting stuck in 2009 and ceased communications in 2010 , while Opportunity remains active as of August 26 , 2018 or 5529 sols since landing , having exceeded its operating plan by 14 years , 122 days ( in Earth time ) . Opportunity has continued to move , make scientific observations , and report back to Earth for over 55 times its designed lifespan . As of January 23 , 2018 , the rover had traveled 45.09 kilometers ( 28.02 miles ) . </P>
<P> Opportunity , also known as MER - B ( Mars Exploration Rover -- B) or MER - 1 , is a robotic rover active on Mars since 2004 . Launched on July 7 , 2003 as part of NASA 's Mars Exploration Rover program , it landed in Meridiani Planum on January 25 , 2004 , three weeks after its twin Spirit ( MER - A ) touched down on the other side of the planet . With a planned 90 sol duration of activity ( slightly more than 90 earth days ) , Spirit functioned until getting stuck in 2009 and ceased communications in 2010 , while Opportunity remains active as of August 26 , 2018 or 5529 sols since landing , having exceeded its operating plan by 14 years , 122 days ( in Earth time ) . Opportunity has continued to move , make scientific observations , and report back to Earth for over 55 times its designed lifespan . As of January 23 , 2018 , the rover had traveled 45.09 kilometers ( 28.02 miles ) . </P>
how far has the opportunity rover traveled during its time on mars
how far has the opportunity rover traveled during its time on mars
45.09 kilometers ( 28.02 miles )
45.09 kilometers ( 28.02 miles )