From their 1979 approval to their 1984 launch, the Chrysler S-chassis minivans would undergo several major redesigns. Originally intended to use 4 sedan-style doors (similar to a station wagon), Chrysler changed to two sliding doors, claiming better parking-lot access. The design was later changed to a single sliding door, as Chrysler wanted to market the van to commercial buyers; while engineers wanted to make the left-side door an option, the tooling complexity was claimed to be too expensive. During development, the configuration of the rear door was also contentious, with a liftgate winning out over a station wagon-style tailgate. On the exterior, in 1981, the side windows were redesigned to become flush with the body; while requiring a major redesign of components and tooling, the design change allowed for a reduction of wind noise and drag. To further reduce costs, a number of visible interior components were shared with the Dodge Aries/Plymouth Reliant, including the instrument panel, interior controls, radio, and various trim items.
Therefore, even though Enceladus is only Saturn's sixth-largest moon, it is amazingly active. Because of the success of the Cassini mission, scientists now know that geysers spew watery jets hundreds of kilometers out into Space, originating from what may well be a vast subsurface sea. These jets, which erupt from fissures in the little moon's icy shell, whisper a siren's song to bewitched astronomers. This is because the jets suggest that the icy moon may harbor a zone where life might have evolved. The jets dramatically spray water ice from numerous fissures near the south pole, that have been playfully termed "tiger stripes." The "tiger stripes" look like giant scratches made by a tiger's raking claws. The precise chemical composition of these very alien lakes and seas remained unknown until 2014, when Cassini's radar instrument detected Ligeia Mare, now known to be Titan's second-largest hydrocarbon-filled lake. Ligeia Mare is brimming with an abundance of sloshing methane, and this enormous liquid reservoir is approximately the same size as two of Earth's Great Lakes combined--Lake Michigan and Lake Huron. Many planetary scientists think that the seabed of Ligeia Mare may be blanketed with a thick layer of sludge that is composed of organic-rich compounds. Earlier infrared data did not have sufficient resolution to separate MK 2 from Makemake's veiling glare. The astronomers' reanalysis, however, based on the more recent HST observations, indicates that much of the warmer surface spotted earlier in infrared light may simply be the dark surface of the companion MK 2.