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A little interesting about space life.

Looking inward from Triton, there are seven regular moons, all of which display prograde orbits in planes that are situated close to Neptune's equitorial plane, and some of these small moons orbit within Neptune's rings. It is thought that these seven small moons were re-accreted from the rubble ring that formed after Neptune snared Triton. This would have occurred some time after Triton's orbit had become circular. In addition, Neptune is circled by six more outer irregular moons other than Triton, including Nereid, whose orbits are considerably farther from Neptune and at high inclination: A trio of these moons sport prograde orbits, while the remainder have retrograde orbits. Indeed, Nereid has an unusually close and eccentric orbit for an irregular moon. This suggests that Nereid may have once been a regular moon that was badly disturbed and nudged into its current position when Triton was snared by Neptune's gravity. The duo of outermost Neptunian irregular moons, Psamathe and Neso, have the largest orbits of any natural satellites known in our Solar System to date.



and here is another

We have known since 1995 that our Solar System is far from unique in the Cosmic scheme of things, and that there are a vast number of planets that circle stars beyond our own Sun. Furthermore, some of these extrasolar planets probably have moons just like most of the planets in our Sun's family. These faraway exomoons are enticing little worlds of wonder and mystery--and possibly even life.



and finally

Astronomers suspected for a very long time that Triton was not born a moon of Neptune, but was instead a luckless refugee from elsewhere that had been kidnapped by its planet. It was not until 2006, however, that a convincing theory explaining how Triton was ensnared by its adoptive parent was proposed. This theory suggests that Triton once had a companion as it orbited the Sun. According to this scenario, Neptune's strong gravitational embrace tugged Triton away from its sister world. This research was reported in the May 11, 2006 issue of the journal Nature.

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Although Europa was visited by the two spacecraft Pioneer 10 and Pioneer 11 in the early 1970s, and the twin Voyagers in 1979, these early flybys only produced grainy, dim images. However, these early pictures revealed enough about the little moon to make it intriguing. Pale yellow icy plains were seen in the Voyager images. The plains also tantalizingly displayed red and brown mottled areas. Long cracks were observed, running for thousands of miles over the shattered eggshell-like crust. On Earth, similar cracks would suggest such features as high mountains and deep canyons. But nothing higher than a few kilometers was seen on the moon. In fact, Europa is one of the smoothest bodies in our Solar System.



In order to do precisely that, Dr. Li and Dr. Milliken used laboratory-based measurements of samples returned from the Apollo missions, combined with a detailed temperature profile of the areas of interest on the lunar surface. Using the new thermal correction, the two astronomers studied the data derived from the Moon Mineralogy Mapper, which is an imaging spectrometer that was carried aboard India's Chandrayaan-1 lunar orbiter.



"Uranus and Neptune and--why not?--systems of satellites around exoplanets that we may identify in the future."