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Interesting facts about space.
Astronomers' current understanding of giant-planet birth predicts an episode of gas accretion that ultimately builds up the enormous size of these gaseous behemoths. According to theory, circumplanetary gas disks, that surround the forming planets during this early period, eventually become the strange nurseries that produce a giant planet's system of moons, thus creating systems of co-planar and prograde (orbiting in the same direction as the planet) natural satellites in a way similar to the many moons of Jupiter and Saturn.
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One of the findings they found out is that the lunar phases are consistently rotating. They go round and round without ending and every cycle is similar as the previous cycle. As there were no tools or technological devices to remind them of time, prehistoric populace only had the moon to be their guidance in life, besides the mighty Sun. The phase of the moon would indicate the time or month of the year, although it was not implied exactly in the form of months like how we are symbolizing the periodic months. But of course, the use of the moon did differ from one culture to another, one religion to the other.
However, weeks before New Horizons' scheduled arrival at its main target, it managed to reveal some strange secrets long-held in the deep freeze of our Solar System's outer limits. For their new study, released in June 2015, a team of planetary scientists collected all available NASA and European Space Agency (ESA) Hubble Space Telescope (HST) data on the four outer moons of Pluto in order to study this strange system in greater depth. Their observations reveal that at least a duo of Pluto's moons are not rotating on their axes in an orderly manner at all, but are instead in chaotic rotation while circling Pluto and its large companion moon, Charon--a moon-world that weighs-in at a hefty 11% of Pluto's mass. Charon is commonly thought to have once been a part of Pluto itself, before it was blasted off in a catastrophic collision with another object billions of years ago. The new study also suggests that one of the mystery moons has a bizarre jet-black coloring of unknown origin and composition. These truly amazing results appear in the June 4, 2015 issue of the journal Nature.
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Alas, this is not the case with Phobos and Deimos. Phobos, the larger of the duo of little Martian moons, at 22 kilometers in diameter, is lazily tumbling towards Mars and will approach the Roche limit in about 20 million years. At this tragic point, it will shatter into fragments that will ultimately form a spectacular ring around its planet. Only Deimos will remain--bereft of its companion. Deimos is the smaller moon of the pair, and circles its parent-planet further out. This last remaining little moon will be a lonely object lingering in the Martian sky at this sad point--but it was not always thus. The new 2016 study suggests that Mars once possessed a very complex system of many moons.
This new method is based on the fact that elements composing our planet's crust that have a tendency to combine with iron--such as iridium and platinum--arrived at Earth after this last giant collision.
Jupiter, like Saturn, is circled by more than 60 known satellites. Many of them are tiny moonlets, measuring only a few miles across, and are probably captured asteroids or minor planets--or their shattered remains.