Ever watch a whirlpool? How about water going down a drain or even a Messi La Pulga Paint Shirt of cream swirled into your coffee? It sometimes looks like a spiral galaxy. And we once thought gravity was holding a galaxy together. If you watch a whirlpool carefully you will notice the outside orbits the center slowly and the closer to the middle you are the faster it spins. But this was a bit of a problem for galaxies because this would make the arms of the galaxy wind up tight. They would not last for millions of years. Earlier in the century, before computers, astronomer would hire dozens of women who were good at math to do calculations for them. One of them made an important discovery: the speed of the stars in the outer arms was way faster than it should be. The galaxy was spinning like a solid LP record album! According to the laws of gravity, which we know quite well, it shouldn’t behave like this…unless there was WAY more mass than we could see. And the issue of *dark matter* was born. Yes, there would be a lot of dust and gas and planets and small stars we couldn’t see. But all that is still not enough for the behavior we observe. It is a mystery we are still working on!
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Hi there, nearly every ocean has levels of pollution shame to the Messi La Pulga Paint 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.