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A little interesting about space life.
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.
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The model indicates that Triton originated as part of a binary system, much like Pluto and its large moon Charon. "It's not so much that Charon orbits Pluto, but rather both move around their mutual center of mass, which lies between two objects," Agnor added.
Titan possesses a smooth, young surface, scarred by comparatively few impact craters. The climate of this frigid moon--including its fierce winds and showers of hydrocarbon rain--carves out surface features that bear an eerie resemblance to those on Earth, such as lakes, sand dunes, rivers, seas, and deltas. Indeed, planetary scientists propose that Titan bears a haunting resemblance to Earth, and is believed to be similar to the way our planet was before life had a chance to evolve out of non-living substances (prebiotic).
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Until 1610, when Galileo Galilei discovered the quartet of large Galilean moons orbiting Jupiter--Io, Europa, Ganymede, and Callisto--Earth's Moon was the Moon, because it was the only moon known to exist. Now, we know differently. There are over 100 known moons in our Solar System alone, and probably many, many more, circling distant alien planets belonging to the families of stars beyond our Sun. Most of the moons in our own Solar System are relatively small, icy worldlets that contain only small amounts of rocky material. The faraway multitude of sparkling, frozen moons that inhabit our Sun's family are mostly found circling the quartet of outer gaseous giant planets--Jupiter, Saturn, Uranus, and Neptune. In this dimly lit region, far from our Star's heat and light, these tiny icy moons perform a strange and lovely ballet around their large, gaseous host planets. The quartet of giant gaseous planets, that inhabit our Solar System's outer suburbs, are enshrouded by heavy atmospheres of gas, and they are accompanied in their travels around our Sun, by their own orbiting entourage of moons and moonlets.
Earth's Moon completes one orbit around our planet every 27 days, and it rotates (spins) at the same rate. Because Earth is also moving--rotating on its axis as it circles our Star--from our perspective our lunar companion appears to orbit us every 29 days.
The crust of Earth's Moon is 43 miles thick on the near-side hemisphere, and 93 miles on the far-side. It is composed of silicon, magnesium, oxygen, calcium, aluminum, and iron. There are also trace amounts of titanium, uranium, thorium, hydrogen, and potassium.