Perseverance Active
Mission name: Mars 2020
Main job: Seek signs of ancient life and collect samples of rock and regolith (broken rock and soil) for possible return to Earth.
Launch date: July 30, 2020
Landing: Feb. 18, 2021, Jezero Crater, Mars
Curiosity Active
Mission name: Mars Science Laboratory (MSL)
Main job: Study the ancient habitability and the potential for life on Mars.
Launch date: Nov. 26, 2011
Landing: Aug. 6, 2012, Gale Crater, Mars
Opportunity Finished
Mission name: Mars Exploration Rover Mission (MER)
Main job: Mars Surface Exploration. Search for and characterize a wide range of rocks and soils that hold clues to past water activity on Mars. Opportunity operated almost 15 years, setting several records and making a number of key discoveries.
Launch date: July 8, 2003
Landing: Jan. 25, 2004, Eagle Crater, Mars
Finish date: Feb. 13, 2019
Spirit Finished
Mission name: Mars Exploration Rover Mission (MER)
Main job: Mars Surface Exploration. Search for and characterize a wide range of rocks and soils that hold clues to past water activity on Mars. Spirit rover — and it's twin Opportunity — studied the history of climate and water at sites on Mars where conditions may once have been favorable to life.
Launch date: June 10, 2003
Landing: Jan. 4, 2004, Gusev Crater, Mars
Finish date: May 25, 2011