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Curious facts about cosmic life and their inhabitants.
Earth's bewitching large Moon was probably born as the result of an immense impact, when a Mars-size protoplanet named Theia smashed into Earth about 4.5 billion years ago. This cataclysmic collision is thought to have hurled a vast amount of Earth-stuff and Theia-stuff into orbit around our ancient planet. Debris from the two unfortunate bodies gradually accumulated to give birth to our Moon, as tumbling little newborn moonlets crashed into one another and melded together into one large object.
and here is another
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.
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!
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Earth's lunar companion is thought to have been born about 4.51 billion years ago, according to a recent study. This means that our Moon was born soon after Earth's formation in the primeval Solar System. The average distance of Earth's Moon from our planet is about 238,900 miles--or approximately 1.28 light-seconds--and it is in synchronous rotation with Earth, always showing the same face, with the near side famous for its beautiful bewitching dark volcanic maria (Latin for seas) that are situated between prominent impact craters and the bright, very ancient, crustal highlands. Our Moon's surface is actually quite dark, even though it appears in the sky at night to be very bright, with a reflectance only a bit higher than that of old asphalt. The prominent position of our Moon in our planet's night sky, as well as its regular cycle of phases, have made our nearest and dearest celestial companion a valuable cultural influence since ancient times in art, mythology, language, and on calendars.
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.
Crida and Charnoz tested their new model to find out whether it could be applied to other planets in addition to Saturn. Their investigation has brought to light several valuable facts. This scenario for moon-birth from planet-rings succeeds in offering an explanation as to why the largest moons dwell farther away from their parent planet than the smaller moons. It further explains the gathering of moons close to the Roche limit--their birthplace--on the outermost fringes of the rings. This distribution is in agreement with what is seen in the Saturn-system. The same scenario can also apply to the moons of other giant planets, such as the ice-giants Uranus and Neptune. The Uranus-system and the Neptune-system are also organized in a similar way. This discovery suggests that long ago, when these planets were young, they also sported impressive rings like those of Saturn--which ultimately vanished when their moons were born. Finally, this scenario can also explain the formation of Earth's Moon, and the moons of the dwarf planet Pluto. According to Crida and Charnoz's calculations, under special circumstances a single moon--like Earth's own--can be born from a primordial ring around its planet. This may well have occurred in both the case of Earth's single large Moon, and for Pluto's largest moon, Charon.