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Key Objectives: Observe the early universe, study exoplanet atmospheres, Year: 2021, Outcome: Deployment complete, operational

Key Objectives: Seek signs of ancient life, collect rock samples, Year: 2021, Outcome: Active, exploring Jezero Crater

Key Objectives: Search for life, characterize Mars' surface and atmosphere, Year: 1975, Outcome: No clear signs of life, provided extensive data

Key Objectives: Map the Moon's surface, search for water, Year: 2009, Outcome: Ongoing mission, detailed lunar maps produced

Key Objectives: Search for exoplanets using the transit method, Year: 2018, Outcome: Ongoing, discovered multiple Earth-sized exoplanets

Key Objectives: First manned lunar landing, Year: 1969, Outcome: Successful landing and return

Key Objectives: Study Jupiter's composition and magnetic field, Year: 2011, Outcome: Ongoing mission, revealed new aspects of Jupiter

Key Objectives: Explore Saturn and its moons, Year: 1997, Outcome: Mission ended in 2017 with intentional dive into Saturn

Key Objectives: Study the Sun's polar regions and solar wind, Year: 1990, Outcome: Mission completed in 2009, enhanced solar understanding

Key Objectives: Asteroid sample return, Year: 2003, Outcome: Returned samples in 2010, suffered multiple technical issues but succeeded

Key Objectives: Discover Earth-like exoplanets, Year: 2009, Outcome: Ended in 2018, thousands of exoplanets found

Key Objectives: Observe X-rays from high-energy regions, Year: 1999, Outcome: Still operational, provided high-resolution imagery

Key Objectives: Study Mars' seismic activity and internal structure, Year: 2018, Outcome: Active, recorded 'Marsquakes'

Key Objectives: Study Jupiter and its moons, Year: 1989, Outcome: Ended in 2003 by intentional crash into Jupiter to avoid moon contamination

Key Objectives: Mars exploration, geological history survey, Year: 2003, Outcome: Successful missions, far surpassed expected lifespans

Key Objectives: Study the Sun's outer atmosphere, Year: 2018, Outcome: Ongoing mission, closest approach to the Sun

Key Objectives: Study Mercury's composition and atmosphere, Year: 2004, Outcome: Completed in 2015, first to orbit Mercury

Key Objectives: Radar mapping of Venus' surface, Year: 1989, Outcome: Mission ended in 1994, successful high-resolution mapping

Key Objectives: Explore Pluto and the Kuiper Belt, Year: 2006, Outcome: Success, first close-up images of Pluto

Key Objectives: Orbit and land on a comet, Year: 2004, Outcome: Successful landing, but the lander, Philae, lost contact

Key Objectives: Asteroid sample return, Year: 2016, Outcome: Sample collected, return to Earth expected in 2023

Key Objectives: Comet and interstellar dust sample return, Year: 1999, Outcome: Successful sample return in 2006

Key Objectives: Demonstrate low-cost landing, explore Mars surface, Year: 1996, Outcome: Successful rover deployment

Key Objectives: Map the Moon's gravitational field, Year: 2011, Outcome: Completed in 2012, improved our knowledge of the Moon's internal structure

Key Objectives: High-resolution imaging and subsurface radar of Mars, Year: 2003, Outcome: Ongoing, contributed to water ice discovery

Key Objectives: Explore Jupiter and Saturn, interstellar space, Year: 1977, Outcome: Extended mission, still transmitting data

Key Objectives: Mars exploration, assess habitability, Year: 2011, Outcome: Active mission, extensive scientific data gathered

Key Objectives: First flyby of Jupiter, explore outer solar system, Year: 1972, Outcome: Successful flyby, lost contact in 2003

Key Objectives: High resolution observations of space, Year: 1990, Outcome: Ongoing mission, revolutionized astronomy