Shapes of Planets Elliptical Orbits newtonian gravity if planet orbits are in the shape of Planets of Orbits Shapes Elliptical

Shapes of Planets Elliptical Orbits newtonian gravity if planet orbits are in the shape of Planets of Orbits Shapes Elliptical

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Voyager 2 flew by Neptune back in 1989, and its observations revealed a number of active geysers, situated within the polar cap heated by the Sun. The geysers hurl out plumes to the impressive height of up to 8 kilometers. Triton has a relatively high density that indicates rocks account for approximately two-thirds of its mass, and ices (mostly water ice) compose the remaining one-third.

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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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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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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.

However, the theory that has long been held to be the most likely explanation is the giant impact theory, suggesting that the Mars-sized body named Theia smashed into the ancient Earth billions of years ago. The monumental blast resulted in a portion of the primordial Earth's crust to be hurled off screaming into Space. This ancient catastrophe tossed a multitude of somersaulting moonlets into the sky, and some of this material was ultimately captured into orbit around the ancient Earth about 4.5 billion years ago, where it finally was pulled together by the force of gravity to become the Moon.

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.