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Interesting facts about space.

Among the ringed gas giant planet Saturn's amazing collection of 62 diverse, bizarre, and beautiful moons and moonlets, sometimes one of them just seems to stand out in the crowd. Such a moon is little Methone. Looking like a shiny white egg in Space, and composed of very lightweight fluffy stuff, Methone is less dense than any other known moon or asteroid in our Solar System. In March 2013, astronomers announced at the 44th Lunar and Planetary Science Conference held in the Woodlands, Texas, that this strange little 5-kilometer-size moon is one of a batch of Space eggs in orbit around Saturn!



and here is another

Dr. Carolyn Porco, a planetary scientist and leader of the Imaging Science team for Cassini, explained to the press in March 2012 that "More than 90 jets of all sizes near Enceladus's south pole are spraying water vapor, icy particles, and organic compounds all over the place. Cassini has flown several times now through this spray and has tasted it. And we have found that aside from water and organic material, there is salt in the icy particles. The salinity is the same as that of Earth's oceans."



and finally

Ganymede, and four other moons dwelling in our Sun's family, possess liquid water beneath their frigid crusts of ice. The others are Saturn's moons, Titan and Enceladus, and two other Galilean moons of Jupiter--Europa and Callisto. Planetary scientists think the oceans of Europa and Enceladus are in contact with rock--thus making these two moons high-priority targets for future astrobiology missions.

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Since its discovery centuries ago, Ganymede has been the target of a great deal of well-deserved attention from the planetary science community. Earth-bound telescopes have gazed at Ganymede's puzzling, icy surface and, in later decades, flyby space missions and spacecraft, circling around Jupiter, have scrutinized Ganymede--trying to solve its numerous mysteries. These observations ultimately unveiled a complicated, icy moon-world, whose bizarre surface showed a strange and puzzling contrast between its two main types of terrain: the dark, extremely ancient and heavily cratered surface terrain, and the much younger--but still ancient--lighter terrain showing a vast array of mysterious grooves and ridges.



"Hydrogen is a source of chemical energy for microbes that live in the Earth's oceans near hydrothermal vents. Our results indicate the same chemical energy source is present in the ocean of Enceladus. We have not found evidence of the presence of microbial life in the ocean of Enceladus, but the discovery of hydrogen gas and the evidence for ongoing hydrothermal activity offer a tantalizing suggestion that habitable conditions could exist beneath the moon's icy crust," explained Dr. Hunter Waite in an April 13, 2017 Southwest Research Institute (SwRI) Press Release. Dr. Waite is principal investigator of Cassini's Ion Neutral Mass Spectrometer (INMS), and lead author of the paper titled Cassini Finds Molecular Hydrogen in the Enceladus Plume: Evidence for Hydrothermal Processes. The SwRI is in San Antonio, Texas.



Like our own Earth, Titan's atmosphere is mainly made up of nitrogen--but with the added ingredient of a small amount of methane. It is the only other world in our Solar System that is actually known to have a cycle of liquids that shower back down to the surface again, in Titan's case as large, lazy drops of hydrocarbon rain. The clouds of Titan pour torrential rains of gasoline down to the surface of this tormented moon. Even though the ingredients are different, this cycle is similar to our own planet's water cycle. Many planetary scientists propose that Titan contains a subsurface ocean of sloshing liquid water.