NASA's Cassini mission and The Grand Finale

On October 15, 1997, NASA in collaboration with European Space Agency and Italian Space Agency Launched a prob to study the planet Saturn and its system, including its rings and natural satellites.
The robotic spacecraft comprised both Cassini probe and Huygens lander, which landed on Saturn's largest moon, Titan.
The Cassini–Huygens space-research mission, commonly called Cassini, was active in space for nearly 20 years, with 13 years spent orbiting Saturn and studying the planet and its system after entering orbit on July first, year 2004.
The journey to Saturn included flybys of Venus in April 1998 and July 1999, Earth in August 1999, the asteroid 2685 Masursky, and Jupiter in December in year 2000.
The mission originally scheduled for four years, from June 2004 to May two thousand eight.
However decommission was extended twice by two years until September 2010, and seven years until September 15, in 2017.