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Interesting facts about space.

Oxygen isotopes on the Earth and Moon measure the same according to the specimens gathered from the Moon, meaning that the Earth and Moon did indeed form at the same distance from the Sun. Finding a theory that could satisfy all three of these specific facts would prove to be rather difficult. There have been three major theories about how the moon was created that have been discounted. Below we will discover what each of these three theories proposed and why they were deemed to be unlikely or impossible. The Fission Theory. The Fission Theory proposes that the Moon was created in the early history of our solar system when something caused the Earth to break apart and a large part of the Earth was cast into space which eventually formed into the Moon. This idea supported the fact that the Earth and Moon share similar mantles, but where this theory falls apart involves the actual physics it would take to create such a scenario. The amount of angular momentum and energy required to create this situation would make the current placement of the Earth and Moon next to impossible. Thus, the fission theory has been deemed incorrect. The Capture Theory. The Capture Theory contends that the Moon came to be obtained by the Earth after it formed in a different location in the solar system, shedding light on the Moon's different composition. There are a couple problems with this scenario. Since we know that the Earth and Moon have the same oxygen isotopes on their surfaces, therefore meaning they would have the same amount of baking from the Sun, it doesn't explain how the Moon would have encountered the extra baking on its surface. The physics behind this call for a lot of specific things to happen, such as the Moon entering Earth's gravitational speed at just the right speed, at just the right distance to allow for the current set-up. Not only would it have to approach the Earth with these two requirements, but there would also have to be something that could slow the Moon down., however, capture into the Moon's present orbit is very improbable. Something would have to slow it down with just the right gravitational pull to cause the Moon to fall into Earth's orbit. While complicated, this could have been possible, but it is very unlikely. The Co-Formation Theory.

and here is another

How did Triton acquire so many strange properties, and why is Neptune's system of satellites so different from those predicted for a gaseous giant planet? Two planetary scientists, Dr. Raluca Rufu (Weizmann Institute of Science, Israel) and Dr. Robin Canup (Southwest Research Institute, US) demonstrate how Triton wreaked catastrophic havoc on Neptune's first generation of very unfortunate moons.

and finally

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.

Other facts:

For most of the 20th century, astronomers thought that Pluto was a lonely little world, a solitary ball of ice circling our Sun, so very far from the comforting warmth and delightful light of our brilliant Star. However, in 1992, the discovery of the first KBO (other than Pluto), made astronomers come to the realization that Pluto is not far from the madding crowd of a vast population of other Kuiper Belt ice balls.

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.

In a study released in November 2011, Dr. Blankenship and his colleagues discovered the enormous subsurface lake on Europa by carefully scrutinizing two bumpy, circular features in the old Galileo images, taken about a decade earlier. The "chaos terrains" were shown to be bizarre regions of floating and colliding icebergs and ice flows. This jumbled mess collapsed portions of the little moon's ice shelf.