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Interesting facts about space.

Triton was the second moon in our Solar System that was found to have a substantial atmosphere, which is primarily composed of nitrogen--with smaller quantities of carbon monoxide and methane. Discovered by William Lassell in 1846, only seventeen days after the discovery of Neptune, Triton is one of the most frigid worlds in our Solar System, with a surface temperature of only about 38 Kelvin. Triton's frozen surface is coated by nitrogen, carbon dioxide, methane, and water ices, and it has a high geometric albedo of more than 70%. Surface features include a large southern polar cap, ancient cratered planes that are cross-cut by scarps and graben, as well as much younger features thought to have been formed by endogenic processes like cryovolcanism (ice volcanoes).



and here is another

Poor Pluto was discovered by the American Clyde Tombaugh in 1930, and it was appropriately named after the ancient Roman god of the underworld, shrouded as it is in the perpetual darkness of our Solar System's distant deep freeze. Charon was discovered in 1978 by the astronomer James Christy, also an American.



and finally

For this reason, for many years astronomers considered the possibility that hydrocarbon lakes and seas might exist on this fantastic moon-world. Data that finally arrived courtesy of the joint NASA and European Space Agency's (ESA's) Cassini-Huygens mission lived up to their expectations. Since arriving at the Saturn system in 2004, the Cassini spacecraft has revealed more than 620,000 square miles of Titan's long-hidden, bewildering surface--and it has shown that almost two percent of Titan's entire surface is covered in liquid.

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The prevailing theory of lunar formation--the Giant Impact hypothesis--proposes that our Moon was born as the result of a disastrous collision between our still-forming proto-Earth and a doomed Mars-sized body named Theia--and this impact is thought to have created a partially vaporized, extremely hot disk of material that swirled around our infant planet. Eventually, this primordial disk cooled off, and ultimately accreted to form our Moon. In February 2018, a team of astronomers announced that their ongoing research is revealing that Earth's Moon may be wetter than initially thought, which raises important questions about some aspects of this origin story.



"That thermally emitted radiation happens at the same wavelengths that we need to use to look for water. So in order to say with any confidence that water is present, we first need to account for and remove the thermally emitted component," Dr. Milliken continued to explain in the July 24, 2017 Brown University Press Release.



Most of Saturn's natural satellites are very small and icy dancing moonlets. However, the larger, icy midsized moons twirl around their enormous ringed planet in a lovely and mysterious dance. The largest of the icy moons is Rhea, Saturn's second-largest moon after the weird world that is Titan. Iapetus, the third largest of Saturn's moons, is two-faced, with one side composed of gleaming, very bright, highly reflective ice, and the other, dark and non-reflective, a blackened splotch staining the pristine white ice. Iapetus is larger than Mimas and Enceladus. There is an enormous impact crater on the moon Mimas, that stands out as a prominent feature on what is apparently a badly bombarded, heavily cratered world. The large impact crater Herschel on this 400-kilometer moon was excavated by a tumbling chunk of space-stuff made of rock, ice, or both, that came very close to powdering the entire little moon. Another icy moon, Enceladus, is a bewitching world, 500-kilometers in diameter, that is thought to harbor a global subsurface ocean beneath its frozen crust. Where there is liquid water there is always the possibility--though, by no means, the promise--of life. Enceladus also has the highest albedo of any other moon in our Solar System. This means that it has the most dazzlingly bright reflective surface. It also possesses a very active geology, rendering it almost free of craters because it is constantly being resurfaced by the emissions of gushing icy geysers that are responsible for fresh snow that keeps the surface of the little moon sparkling and smooth.