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A little interesting about space life.

Banded, beautiful, and a bewitching sapphire blue, the ice-giant planet Neptune is the most distant major planet from our Star--and it is also circled by a bizarre large moon that may not have been born a moon at all. Neptune's moon, Triton, may really be an uninvited guest--the alien changeling child, taken in from the cold, by its current parent-planet, Neptune. Triton shows features that hauntingly resemble those seen on the dwarf planet Pluto, an icy denizen of the remote Kuiper Belt. The Kuiper Belt is a reservoir of a multitude of sparkling icy comet nuclei, as well as other frozen bodies--some large, some small--situated in a ring around our Sun beyond Neptune's orbit. Triton and Pluto share roughly the same density and bulk composition, as well as similar atmospheres--and they both travel in unusual orbits. Also, Neptune's system of moons is not what astronomers expect for a gaseous ice-giant planet, inhabiting the outer Solar System. In November 2017, a team of astronomers announced that they have explored the possibility that Neptune was really born with an ordinary system of moons that was later destroyed when it captured its murderous giant moon, Triton.



and here is another

Triton and Pluto share roughly the same bulk composition and density, as well as similar atmospheres. In addition, both remote bodies move in unusual orbits. Pluto has a highly eccentric orbit, and is sometimes closer to the Sun than Neptune! Furthermore, Pluto orbits in the opposite direction around our Sun than do the eight major planets of our Solar System. Triton revolves around Neptune in a direction counter to that of its planet--and its retrograde orbit indicates that it is a captured object. Because of the unusual nature of both Triton's and Pluto's orbits, as well as the similarities of their bulk properties and atmospheres, it has long been thought that there is some sort of historical connection between them. Indeed, it was once thought that Pluto was an escaped moon of Neptune, but this is now considered unlikely. It is much more likely that long ago Triton, like Pluto, circled the Sun independently, but was unluckily captured by its adoptive planet--whereas Pluto was left to wander freely.



and finally

In dramatic contrast, the inner region of our Solar System, where our Earth dwells--along with Mercury, Venus, and Mars--is relatively barren of moons. Mercury and Venus have no moons, and Mars is orbited by a small duo of deformed moons, Phobos and Deimos, that are probably asteroids that escaped from the Main Asteroid Belt between Mars and Jupiter billions of years ago--only to be captured by the Red Planet's powerful gravitational embrace. Our Earth is the only inner planet that possesses an impressively large, spherical Moon.

Other facts:

A fourth, more recent model, is based on the existence of a synestia. A synestia is a doughnut-shaped cloud composed of vaporized molten rock. This recently discovered inhabitant of the Universe is believed to take shape when planet-sized bodies catastrophically blast into one another with both high energy and angular momentum. Soon after the discovery of these puffy celestial "doughnuts" in 2017, planetary scientists came to the realization that they may have a new way to explain Moon-birth. The ancient collisions, that create a synestia, are so violent that the objects that form from these cosmic crash-ups melt and partially vaporize. Ultimately, after having cooled off sufficiently to solidify, they create (almost) spherical planets, such as those inhabiting our own Solar System.



For a very long time, planetary scientists favored the scenario that the duo of potato-shaped Martian moons were probably snared asteroids. However, the pair's circular orbits at the equator indicated otherwise. The orbits of the little moons suggested that they had really formed from a giant impact billions of years ago. The new research, published in the July 4, 2016 issue of Nature Geoscience, proposes that a massive 2,000 kilometer protoplanet crashed into the primordial Mars. The horrendous impact resurfaced most of the Martian surface and hurled a mass of debris, more than 100 times the mass of both Phobos and Deimos, into orbit around the Red Planet.



There is an important distinction between the way giant planet systems form--such as those belonging to Jupiter, Saturn, Uranus, and Neptune--and the way that the rocky planets such as Earth, and the dwarf planet, Pluto, take shape. The gaseous giant planets are surrounded by rings, a myriad of moons, and a vast number of tiny dancing moonlets, whereas the rocky planets have none, or only one moon, and no rings to be seen. Until this new model was developed, two scenarios were generally used to explain how the regular moons of our Solar System were born. These two commonly used explanations suggest that the moons of Earth and Pluto came into being following catastrophic impacts. They further suggest that the moons of the giant, outer planets were born in a nebula floating around the newborn gigantic planet. They fail, however, to explain the distribution and chemical composition of the moons circling the gigantic outer four. Something, therefore, up until now, has been missing.