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A Distant, Dusty Moon. Titan experiences changing seasons--just like Earth. In particular, Titan's seasons change around the equinox, when our Sun passes Titan's equator. At this time, huge clouds can form in tropical areas, resulting in violent methane storms. Cassini observed these ferocious methane storms during several of its flybys over Titan.
Discovering the little moon also reinforces the theory that most dwarf planets have moons.
Enceladus: Enceladus has shown geysers of water that were confirmed by the Cassini spacecraft in 2005. Gravimetric data obtained from 2010 to 2011 confirmed the existence of a subsurface ocean. Even though originally it was thought to be localized, most likely in a region of the icy moon's southern hemisphere, evidence collected in 2015 indicates the subsurface ocean is actually global. Furthermore, in additon to water, these geysers from vents located near the south pole of Enceladus contain tiny quantities of salt, nitrogen, carbon dioxide, and volatile hydrocarbons. Tidal flux from Saturn is apparently responsible for the melting of the ocean water, as well as the geysers.
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Titan has a radius that is about 50% wider than Earth's Moon. It is approximately 759,000 miles from its parent-planet Saturn, which itself is about 886 million miles from our Sun--or 9.5 astronomical units (AU). One AU is equal to the average distance between Earth and Sun, which is 93,000,000 miles. The light that streams out from our Star takes about 80 minutes to reach Saturn. Because of this vast distance, sunlight is 100 times more faint at Saturn and Titan than on Earth.
From these observations planetary scientists were able to determine that almost 98% of the gas in the plume is water, about 1% is hydrogen, and the rest is a combination of other molecules that include methane, ammonia, and carbon dioxide.
In September 2015, a team of astronomers released their study showing that they have detected regions on the far side of the Moon--called the lunar highlands--that may bear the scars of this ancient heavy bombardment. This vicious attack, conducted primarily by an invading army of small asteroids, smashed and shattered the lunar upper crust, leaving behind scarred regions that were as porous and fractured as they could be. The astronomers found that later impacts, crashing down onto the already heavily battered regions caused by earlier bombarding asteroids, had an opposite effect on these porous regions. Indeed, the later impacts actually sealed up the cracks and decreased porosity.