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It is important to know at any age!

The Kuiper Belt is populated by mostly small, frigid objects, which are relics of our Solar System's formation 4.56 billion years ago. Most KBOs are primarily composed of frozen volatiles, such as water, methane, and ammonia. The Kuiper Belt is also the home of two other officially designated dwarf planets (in addition to Pluto): Haumea and Makemake. A few of our Solar System's moons, such as Saturn's Phoebe and Neptune's Triton, are also commonly thought to have been born in this distant and mysterious region.



and here is another

There are currently over a thousand known KBOs, and more than 100,000 KBOs over 62 miles in diameter are believed to exist. Pluto is compositionally similar to many other objects inhabiting the Kuiper Belt, and its orbital period is characteristic of a class of KBOs termed plutinos, that share the same 2:3 resonance with Neptune.



and finally

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.

Other facts:

Europa, is a fascinating, frigid little world. It is one of the four Galilean moons, discovered in January 1610 by the great Galileo Galilei when he was gazing up into the night sky with his small, primitive "spyglass". The other Galilean moons, the weird sisters of Europa, are Io, Ganymede, and Callisto.



Earth's Moon was thought to be The Moon--and the only moon--until Galileo Galilei took his primitive telescope up to the roof of his house in Padua in January 1610. Galileo aimed his telescope up to the clear starlit night sky above his home--one of the first to be used for astronomical purposes--and aimed it at the giant planet Jupiter. As a result, Galileo discovered the four large Jovian Galilean Moons, eventually named in his honor: Io, Europa, Ganymede, and Callisto.



The lunar mantle reaches from the top of the partially molten layer to the bottom of the lunar crust. It is thought to be made up of minerals like pyroxine and olivine--both of which are composed of magnesium, iron, silicon and oxygen atoms.