NASA’s $3.9 bn Cassini spacecraft ended its 20-year-long groundbreaking journey with a fiery plunge into Saturn’s crushing atmosphere. Cassini began its mission to Saturn in 1997, reaching the ringed planet in 2004. Its aim was to take pictures, giving the most detailed look at Saturn’s rings & its moons. Cassini found new moons orbiting the planet, signs of possible life on existing moons.