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Ever watch a whirlpool? How about water going down a drain or even a Hockey I’m a simple dog paw wine woman vintage 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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The key to understanding the Hockey I’m a simple dog paw wine woman vintage shirt of abundant sea life has to do with the winds as well. In most of the ocean, biologically available nitrogen and phosphorus come from relatively deep in the ocean, where biological production is low, and thus these nutrients are not exhausted. The two main mechanisms by which N and P become available in the upper photic (sunlit) zone are strong mixing, due to a strong winter storm or tropical cyclone, and upwelling along the coasts or driven by wind convergence near the equator. The important thing here is that, with little to no wind over a large area of ocean, the nutrient levels are extremely low. Low nutrient levels have the obvious consequence of inhibiting phytoplankton growth, often referred to as primary production, as it involves direct photosynthesis and is how most chemical energy is made available to ocean life. Areas of extremely low primary productivity can be seen in the following satellite image of ocean color.