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Interesting facts about space.
However, Neptune is wacky. This giant gaseous world has only a small number of moons when compared to the other three gaseous giant planets in our Sun's outer realm: Jupiter, Saturn, and Uranus. Of the quartet of giant planets that inhabit our Sun's outer kingdom, Jupiter and Saturn are classified as gas-giants, while Uranus and Neptune are ice-giants. While all four planets are enormous in size, Jupiter and Saturn are much larger than Uranus and Neptune, and possess much more massive gaseous envelopes. The ice-giants, Uranus and Neptune, are smaller, contain larger solid cores, and sport less massive gaseous envelopes than their two gas-giant planet kin.
and here is another
"We've found a likely solution to the long-standing problem of how Triton arrived in its peculiar orbit. In addition, this mechanism introduces a new pathway for the capture of satellites by planets that may be relevant to other objects in the Solar System," explained Dr. Craig Agnor, a researcher from the University of California, Santa Cruz, in the May 10, 2006 issue of Time Magazine.
The most detailed pictures of Europa show even more intriguing clues that there is slush lurking beneath its brightly shining icy surface. Slightly smaller than Earth's own beloved Moon, Europa's surface temperature could easily freeze an ocean solid over a span of only several million years. However, some astronomers think that warmth from a game of tidal tug-of-war between Europa and Jupiter, as well as other neighboring moons, could be keeping large regions of Europa's subsurface global ocean in a life-friendly liquid state. This process is termed tidal heating, and it refers to a mechanism whereby the gravitational tugs of a nearby object (or objects) flex and bend and contract and expand another object continually. This constant churning causes the victimized object, in this case Europa, to heat up and be considerably more balmy than its great distance from the Sun would otherwise allow it to be.
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Even though Theia came to a tragic end, it did not die in vain. This is because the ill-fated Theia made the emergence of life possible on Earth. Our lunar companion is responsible for creating a welcoming abode for living things on our planet, because it moderates Earth's wobble on its axis--thus creating a stable, life-friendly climate. Earth's Moon also is the source of ocean tides that form a rhythm that has guided human beings for thousands of years.
The vanished, ill-fated, large moon could have been a few hundred kilometers in diameter. The large moon would also have allowed a handful of other smaller moons to form--including the duo of small, shapeless ones that survive today. However, this large inner moon would have been born close to or within the Roche limit. This is why it is likely that it crashed into Mars as a result of tidal forces within several million years--and the collection of other small moons followed their leader. Only Phobos and Deimos kept their distance.
If this ancient catastrophic impact really did occur, there should be deposits of these tragic moons on the Martian surface. The Japanese Aerospace Exploration Agency (JAXA) is currently planning a sample return mission to Phobos and Deimos, the Martian Moons Explorer, and NASA has plans to eventually return samples to Earth from the surface of Mars-- perhaps as soon as the 2020s. At the conclusion of their paper, the authors note, "Our scenario provides further motivation for a sample return mission to the Martian satellites."