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A little interesting about space life.
Over the years, several theories have been proposed to explain the mechanism involved in Triton's capture by Neptune. One theory suggests that Triton was snared in a three-body encounter. According to this scenario, Triton is the lone survivor of a binary Kuiper Belt Object (KBO) that had been fatally jostled during a destructive close encounter with Neptune.
and here is another
However, the truth is, during their entire voyage to the Moon and back to Earth, Armstrong, Aldrin and Collins only received amount of radiation equal to about 0.1% of the deadly dose. Their total exposure was approximately 11 milisieverts, and radiation dose lethal to an average human being is aroung 8,000 millisieverts.
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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In their research, the planetary scientists combined several radar observations of heat given off by Ligeia Mare. They also studied data collected from a 2013 experiment that bounced radio signals off Ligeia Mare. The results of that experiment were presented in a 2014 paper led by Cassini radar team associate Dr. Marco Mastroguiseppe of Cornell University in Ithaca, New York, who also was part of the new study.
The research published in the July 4, 2016 issue of Nature Geoscience highlights the main factor differentiating moon-birth around Mars and Earth: the differing rotation speeds of the two planets prompted "completely different tidal actions," Dr. Charnoz explained in the July 4, 2016 CNRS Press Release. Dr. Charnoz proposes that at the time of their respective impacts, "Earth took less than four hours to spin on its axis whereas Mars rotated very slowly over a 24-hour period." The result of this important difference caused Earth to hold on to its single, large Moon, while the Martian collision created a dozen smaller moons alongside a larger moon. As time went by, Martian tidal action--resulting from the planet's slow rotation rate--caused most of the moons, including the largest one, to crash back down to the surface of their parent-planet. As a result, only the two most distant moons, Phobos and Deimos, survived as testimony to the ancient catastrophe.
JAXA has announced a space mission scheduled to begin in 2022, with an expected return to Earth in 2026. "Its objective is to carry out close-up remote sensing and in-situ observations of both Phobos and Deimos, and to bring back samples from Phobos," commented Dr. Ryuki Hyodo in the July 4, 2016 CNRS Press Release. Dr. Hyodo is a planetary scientist, originally from Kobe University in Japan, and he is also currently collaborating with the IPG. "High-resolution impact simulations are still needed to understand more about the disk structure," he continued to explain to the press.