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The harmful effects of radiation are based both on its strength and the time of exposure to its source. Average human would need to spend nearly four months inside the Van Allen belts to accumulate a lethal dose. The astronauts managed to pass through them during less than one hour. Regarding the time spent out of Earth's magnetic field, where the astronauts were exposed to solar radiation, an average human could endure a radiation exposure equivalent to one-way trip to Mars and still not receive a dose which exceeds lifetime levels set up by NASA.
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Kepler-22b is an extrasolar planet that circles Kepler-22, a G-type star that is situated about 600 light-years from our own planet in the constellation Cygnus. This intriguing new world, that resides beyond our Solar System, was first spotted by NASA's highly productive, though ill-fated, Kepler Space Telescope in 2011. Kepler-22b has the distinction of being the first known transiting extrasolar planet to reside within the so-called habitable zone of its star. The habitable zone is the term used to describe that Goldilocks region around a star where water can exist in its life-loving liquid state. Planets dwelling in this fortunate region are not too hot, not too cold, but just right for water and, hence, life to exist. A planet that circles its star in the habitable zone suggests that there is the possibility--though not the promise--of life as we know it to exist on that world.
Triton is the largest of Neptune's 13 moons. It is an unusual world, twirling around its planet in the wrong direction. Many astronomers think that some time in the remote past, Triton was nudged out of its home in the Kuiper Belt, and during its wanderings in the darkness of interplanetary space, at last swept close enough to Neptune to feel the irresistible lure of that planet's gravity. As Neptune drew Triton into its gravitational embrace, that luckless wanderer from the Kuiper Belt underwent a sea-change from a comet-like denizen of our Solar System's outer limits, to a moon of one of the major planets. So, there Triton whirls around in its new home, circling its planet Neptune, but circling it backwards. And like all moons, it is now a dependent of its parent planet. As a matter of fact, the moon was given the name of Triton as an allusion to the demigod Triton's dependence on the sea-god Neptune in Greek mythology.
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Planetary scientists usually calculate the Moon's age by using the radioactive decay of elements like uranium, explained Dr. John Chambers in the April 2, 2014 National Geographic News. Dr. Chambers is a planetary scientist at the Carnegie Institution for Science in Washington, D.C. By studying an element with a recognized decay rate, and knowing its concentration in Moon rocks or the Earth's surface, scientists are able to calculate back in time to when the material first formed. However, there are numerous and varying radioactive materials that can provide differing timelines, added Dr. Chambers, who was not involved in the study.
Asphaug and co-author Dr. Andreas Reufer of the University of Bern in Switzerland, devised their new giant impact model using sophisticated computer simulations. They discovered that mergers between moons the size of Jupiter's Galilean satellites--which range in size from 1,940 miles wide (Europa) to 3, 271 miles across (Ganymede)--would tear icy stuff off the outer layers of the colliding moons. This icy material would then form spiral arms, which would ultimately merge together due to gravitational attraction to create Saturn's mid-sized icy moons.
Volcanic Eruptions and the Moon. The arguments how the Moon effect our lives are not always clear but the more bizarre it sounds the more it can be true. Astronomers studying the Moon and volcanoes began to see a pattern. It appeared that the effect of the Moon on volcanoes is greater than we thought. Volcanoes erupt any time but when studied it was found that they tend to erupt more when the Moon is full and during the New Moon. This was proven to a point that eruptions could be predicted to within minutes. More research showed that major eruptions in history all coincided with the phases of the Moon.