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Curious facts about cosmic life and their inhabitants.

The name moon jellyfish is purely descriptive. They are named for the most prominent part of their anatomical makeup, their large disk or full moon shaped bell. They can be further distinguished by the four horseshoe-shaped gonads at the center of their bell. These reproductive organs resemble the craters found on the moon. These fish are very popular as pets because they are transparent and will appear to glow in whatever color is shined through them. They look particularly stunning in an aquarium with an LED fader system set up in it. Another point in their favor is that their stinging cells do not produce enough pressure to pierce human skin. In the wild, a moon jelly's life cycle is limited to one year form start to finish. In captivity they can easily live up to three years. These jellies can grow up to one foot in diameter.



and here is another

The outer Solar System is more richly endowed with moons than the inner regions. The two enormous gas giant planets, Jupiter and Saturn, and the ice giant planets, Uranus and Neptune, have numerous moons of various sizes, shapes, and origins. As these enormous planets grew, during the early days of our Solar System, they were able to ensnare wandering objects with their mighty gravitational grips.



and finally

Jupiter, the largest planet in our Solar System, also has the largest moon--Ganymede. A large number of Jovian moons sport highly elliptical orbits and also circle backwards--that is, opposite to the spin of their planet. Saturn, Uranus, and Neptune also sport such so-called irregular moons, that orbit far from their respective parent planets.

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"More generally, our findings clarify how giant impacts give birth to satellites and can create a diverse variety of satellite systems," Dr. Charnoz told the press on July 4, 2016. He added that the team could apply their method to other regions of our Universe:



This later-forming time line for lunar birth is reasonable, Dr. William Hartmann noted in the April 2, 2014 National Geographic News. Dr. Hartmann, a researcher at the Planetary Science Institute in Tucson, Arizona, was one of the first to propose the giant impact theory of lunar formation. However, he added that the new study might depend too much on the idea of using the last giant impact as a marker for when such events occurred in the history of our planet.



Two French astrophysicists, proposing the new, alternative scenario explaining moon-birth, reported their findings in a paper titled: Formation of Regular Satellites from Ancient Massive Rings in the Solar System, published in the November 30, 2012 issue of the journal Science. Dr. Aurelien Crida, an astrophysicist at the University of Nice--Sophia Antipolis and the Observatory of Cote d'Azur in France, explained in the November 29, 2012 issue of Scientific American that "It's fundamentally the same process that gave birth to the Moon and to the satellites of the giant planets, and that's the spreading of rings." Dr. Crida is a co-author of the study with Dr. Sebastien Charnoz of the University of Paris--Diderot.