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2019 Space Missions 2019 space exploration gt data directions inc Space 2019 Missions

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If the authors' proposal is correct, then it successfully explains why Neptune's moon system looks so strange compared to Jupiter's or Saturn's--which means that astronomers' models of how these primordial systems form around gaseous giant worlds still hold strong.



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!



and finally

Titan is the largest moon of the gas-giant planet Saturn, as well as the second-largest moon in our entire Solar System--after Jupiter's enormous Ganymede. Indeed, this smoggy orange moon is almost as big as the planet Mars! Because Titan is situated in the outer domain of our Solar System, circling Saturn--which is the sixth major planet from our Star, the Sun--it is extremely cold, and its chemical atmosphere is frozen. This very interesting atmosphere is composed of a mix of compounds that many astronomers think are comparable to those that existed in our own planet's primordial atmosphere. Titan's strange, dense, orange atmosphere contains large quantities of "smoggy" hydrocarbons. This very heavy shroud of obscuring smog is so extremely dense that it showers "gasoline-like" rain down on the tortured surface of this distant moon-world.

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"A major difficulty has been to explain why a giant impact on Mars would have left two moons so different from our own Moon, a huge single mass, that also formed from Earth undergoing such an impact," explained Dr. Sebastien Charnoz in a July 4, 2016 Centre National de la Recherche Scientifique (CNRS) Press Release. Dr. Charnoz is a planetary scientist at the Institut de Physique Du Globe De Paris (IPG) who contributed to the new research.



There are ongoing studies assessing the past habitability potential of the Red Planet, as well as the possibility of life.



In addition, this new study weakens certain theories that some planetary scientists suggest as explanations for the formation of other rocky, terrestrial planets like Venus and Mars, Dr. Jacobson believes.