Cassini, which began its journey over two decades ago, facilitated the publication of more than 3,000 scientific papers with the data it collected and is responsible for several major discoveries,
including liquid methane seas on Titan and evidence of hydrothermal activity on Enceladus.
The joint Jupiter mission beat out a competing proposal to send probes to Saturn,
including a balloon and lander to explore Saturn's moon Titan, which boasts a thick atmosphere and lakes of
liquid methane and ethane.
A partial list of properties surveyed
includes density (expressed as API gravity), vapor pressure, initial boiling point, boiling point distribution, flash point, gas — oil ratio, «light ends» (dissolved gases —
including nitrogen, carbon dioxide, hydrogen sulfide,
methane, ethane, and propane — and butanes and other volatile
liquids) composition, and flash gas composition.