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A little interesting about space life.
Of the hundreds of bewitching moons in our Sun's family, Titan is remarkable for being the only one boasting a dense atmosphere and large liquid reservoirs on its surface, rendering it in many ways more like the four rocky, terrestrial planets of the warm and well-lit inner Solar System. Indeed, both Earth and Titan possess atmospheres dominated by nitrogen--more than 95 percent nitrogen in Titan's case. However, unlike our Earth, Titan's atmosphere has very little oxygen; the remainder of its atmosphere is primarily composed of methane and trace quantities of other gases--such as ethane. At the truly frigid temperatures found at the Saturn system's great distance from our Sun, Titan's methane and ethane can exist on the surface in their liquid form.
and here is another
Saturn, along with its frozen retinue of icy rings, dazzling moons, and sparkling moonlets, orbits our Sun about ten times farther out than the Earth. Astronomers received their first collection of detailed data about Titan when the Cassini/Huygens orbiter and lander arrived there in 2004. The Huygens lander successfully obtained revealing images when it drifted down to Titan's tormented, hydrocarbon-slashed surface, as well as when it was still floating slowly and softly down through the moon's thick, foggy, orange atmosphere--which has 1.4 times greater pressure than that of our own planet. These pictures, when combined with other studies using instruments aboard the Cassini orbiter, reveal to curious planetary scientists that Titan's geological features include lakes and river channels filled with methane, ethane, and propane. Titan's strange surface also shows mountains and sand dunes--and it is pockmarked by craters. The rippling dunes form when fierce winds sweep up loose particles from the surface and then tosses them downwind. However, the sands of Titan are not like the sands on our Earth. Titan's "sand" is both bizarre and alien, probably composed of very small particles of solid hydrocarbons--or, possibly, ice imprisoned within hydrocarbons--with a density of about one-third that of the sand on our own planet. Furthermore, Titan's gravity is low. In fact, it is only approximately one-seventh that of Earth. This means that, working in combination with the low density of Titan's sand particles, they carry only the small weight of a mere four percent that of terrestrial sand. Titan's "sand" is about the same light-weight as freeze-dried grains of coffee!
For a long time, planetary scientists thought that in the aftermath of the Moon-forming collision, hydrogen dissociated from water molecules. According to this scenario, both water and other elements that have low boiling temperatures (volatile elements), escaped from the disk and were lost forever to space. This model would form a volatile-element-depleted and bone-dry Moon. At the time, this scenario seemed to be consistent with earlier analyses of lunar samples.
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Planetary scientists believed for years that Earth's Moon is depleted of water and other volatile compounds. However, this idea began to change in 2008, when a team of scientists announced that they had detected traces of water in some of the volcanic glass beads carried back to Earth from the Apollo 15 and 17 missions to the Moon. In 2011, additional study of extremely small crystalline formations within those beads revealed that they contain amounts of water that are similar to some basalts on Earth. This indicates that the lunar mantle--at least, part of it--contains as much water as Earth's.
There are more than 100 moons in orbit around the eight major planets of our Sun's family. Most of them are frozen worlds, primarily composed of ice with a smattering of rocky material, circling the four giant gaseous planets dwelling in the outer regions of our Solar System--Jupiter, Saturn, Uranus, and Neptune. The inner region of our Solar System is almost completely devoid of moons. Earth's own lovely Moon is the largest one in our inner region of the Sun's family. Of the four rocky and relatively petite inner worlds that circle nearest to our Star--Mercury, Venus, Earth, and Mars--Mercury and Venus are moonless, while Mars is orbited by two lumpy and misshapen small moons, Phobos and Deimos, that are most likely captured asteroids that originated in the Main Asteroid Belt that orbits our Sun between Mars and Jupiter.
Such moon-forming mergers and collisions are not unheard of. For example, the leading theory explaining the formation of Earth's own large Moon, suggests that it was born about 4.5 billion years ago when a Mars-sized protoplanet, dubbed Theia by astronomers, collided with our planet. Just as our Moon is identical geologically to Earth's mantle, the six medium-sized icy sister moons of Saturn are all similar in composition to Titan's icy mantle, the researchers announced in October 2012.