Descrição:
Saturn's moon, Enceladus is only one-seventh the diameter of Earth's moon. It is the sixth largest and most massive moon of Saturn. Like most spherical bodies, it takes the shape of an oblate spheroid, bulging out slightly around its equator due to the effects of gravity as it spins. This tiny satellite is one of the most promising potential sites for hosting life in the solar system. Despite its frigid temperatures, the moon hosts liquid water beneath its surface that appears to directly contact the rocky seafloor, making complex chemical reactions possible — such as those reactions that lead to life. Because the moon is not very massive, and feels only the smallest tug of gravity at its surface, scientists were surprised to discover that it has an atmosphere, which dominates at its warmer south pole. Further observations by NASA's Cassini mission revealed cracks in the surface, known as 'tiger stripes', which periodically vented material into space. While some of the icy eruptions fed the moon's atmosphere, much of the material escaped into space. At least 101 geysers vent icy material from beneath the moon's into space as the moon interacted with its parent planet. Gravitational forces open and close the cracks as Enceladus travels closer to and farther from Saturn over the course of its elliptical 1.37-Earth-day orbit. Although the surface of Mimas is heavily cratered, the most striking feature of this small moon is a gigantic crater known as Herschel. It was named after Mimas' discoverer, Sir William Herschel. This crater measures a whopping 80 miles (130 km) across. A central peak in the center of the crater rises to a height of 4 miles, almost as high as Mount Everest on Earth. Since Mimas is only 242 miles (392 km) in diameter, this crater is almost 1/3 of the entire moon's diameter! Astronomers believe that if the object that caused this impact had been any larger, it would have completely destroyed Mimas. This impact was so devastating, in fact, that fracture marks can be found on the opposite side of the moon from the crater. This giant scar gives Mimas the look of a giant eyeball in some photos. Those of you who are Star Wars fans will no doubt see another resemblance. The low density of Mimas indicates that it is composed almost entirely of water ice, very much like Dione and Rhea. Mimas is also covered with small impact craters, but the cratering is not even. Most of the craters average about 25 miles (40 km) in diameter, but craters in the South Polar Region average only 12 miles (20 km). This suggests something may have covered up the larger craters. The fact that none of the other craters are as large as Herschel have led some astronomers to speculate that a previous impact may broken the moon into pieces, which then coalesced to reform the moon into what we see today. Mimas has no detectable atmosphere and no magnetic field. Mimas Time period of orbit around Saturn = = 0.942422 Earth days Enceladus Time period of orbit around Saturn = 1.370218 Earth days from the formula in Physics, f = 1/t, frequency equals one over time where the units of per time match on both sides of equation, we can compute the orbital frequency of these moons of Saturn but we have to get in time units of seconds, so For Mimas, f = 1/(0.942422days * 24 hrs * 60 mins * 60 secs) f =0.00001228120 Hz For Enceladus, f = 1/(1.370218days * 24 hrs * 60 mins * 60 secs) f = 0.000008446885 Hz These frequency are far too low to hear of course but we can double and double again and again many times to have a pair of frequencies in hearing range of Audio. Doubling 24 times For Mimas, f =0.00001228120 Hz*(2^24) = 206.044363078 Hz For Enceladus, f = 0.000008446885 Hz*(2^24) =141.7152166595 Hz We generate the sound for these pair of frequencies sinusoidally 206.044363078 / 141.7152166595 = 1.4539 which is acting as a (3/2) resonance The same as a Perfect Fifth interval in Music , having a beating pulsating effect because it is slightly mistuned. The Beating frequency can be calculated by a formula: 2*(1.4539 - 3/2)*141.7152166595 Hz =13.057 Hz The sound wave is made to oscillate even over a slower period corresponding with Saturn's Time period of 29.456 years =10759 days to orbit Sun. 141.7152166595 Hz *1.370218days/10759 days = 0.018048 Hz is The Saturn Year oscillation frequency in this waveform. The sound session provided is not meant to replace or substitute the recommendations or advice of your physician or health care provider. This video should not be used for diagnosing or treating a health problem or disease. If you believe you have a medical condition or problem contact your health care provider.0
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