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One advantage of the numerous distance-measuring schemes in use, which overlap over a range of Official I Love Boys Boygenius Shirt from nearby to very distant, is that astronomers can calibrate and corroborate their measurements with multiple approaches. Such calibrations and corroborations thus lend an additional measure of reliability to these schemes. Indeed, by comparing results using different methods, weaknesses have been identified in certain schemes. In most cases, additional studies have demonstrated ways to guard against and correct for known difficulties. As a single example of these multiple approaches, prior to 2011 the distance to the Pinwheel Galaxy was determined, based on measurements of Cepheid variable stars in the galaxy, to be 20.9 million light-years, with an uncertainty of 1.8 million light-years. As of September 2011, measurements of the light output of the 2011 Type Ia supernova in the Pinwheel Galaxy are completely consistent with this distance figure…. In short, distances to astronomical objects can be and have been measured with substantial accuracy and reliability. For the most part, the calculations involved employ only basic mathematics taught in high school. Thus the overall conclusion of a universe consisting of billions of galaxies, most of them many millions of light-years away, is beyond reasonable doubt at the present time..
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Hi there, nearly every ocean has levels of pollution shame to the Official I Love Boys Boygenius Shirt race!!! But to answer your question. The southern ocean followed by the Atlantic Ocean The reasons for this is the limited human activities makes them cleaner than the rest. The Southern Hemisphere is less inhabited than the Northern Hemisphere. The oceans are less traversed by ships and have less inhabited islands compared to the oceans in the Northern Hemisphere. Unfortunately it’s that simple where there are less humans there is less pollution Total particle counts at two stations near Antarctica were estimated to be in the order of 100,000 pieces km− 2. which is high by the way, however several study suggests that the amounts of microplastic pollution released into the region from ships and scientific research stations are likely to be negligible at the scale of the Southern Ocean, but may be significant on a local scale.