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A little interesting about space life.

When Apollo 11 landed on the Moon in 1969, we were presented with our first human contact with the moon. The mission was able to accomplish the task of not only landing on the Moon, but also to return to the Earth with samples from the Moon. These samples along with subsequent presented us with answers regarding the composition of the Moon, which also gave us some basic facts that any theory about how the moon was created must answer/address. We learned:The Moon does not contain an iron core like our Earth does, due to the fact that the Moon's density is only 3.34 grams per cubic centimeter (compared to the Earth's which is 5.52 grams per cubic centimeter).Samples collected from the surface of the Moon reveal that it underwent extreme heat and baking, much more than what the Earth experienced.



and here is another

Triton is unique among our Solar System's moons of planetary mass. This is because its orbit is retrograde to Neptune's rotation and inclined relative to Neptune's equator. This suggests that Triton was not born in orbit around Neptune, but was instead snared by the giant planet.



and finally

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.

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Numerical simulations have been conducted that show that there is a 0.41 probability that Neptune's moon Halimede blasted into Nereid in the past. Even though it is not known if this collision really did occur, both moons display similar grey colors. This implies that Halimede could be a chunk of Nereid that broke off during the collision.



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.



Saturn is probably the most beautiful planet in our Sun's lovely family, with its magnificent system of enchanting rings, gleaming icy moons, and myriads of tumbling moonlets that dance and somersault both within and outside of the rings. One of Saturn's moons is Titan, the second largest moon in our Solar System, after Ganymede of Jupiter. Shrouded in a dense orange mist, Titan is famous for its frozen clouds of methane, and hydrocarbon seas and lakes. Titan's thick, veiling atmosphere is composed of a wonderful icy soup of compounds very much like those thought to have been present in Earth's primordial atmosphere. Titan's thick atmosphere--which is much denser than Earth's atmosphere--contains mostly nitrogen, like that of our own planet. But Titan's atmosphere also contains significantly greater percentages of such so-called "smoggy" chemicals as methane and ethane. The smog on Titan is so extremely dense that it actually rains "gasoline-like" liquids down on the surface of this bizarre world. Indeed, some of the chemicals discovered in Titan's atmosphere might indicate that simple and primitive methane-based life (methanogens), might dwell on this truly weird moon.