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I watched a cool lab video on a professor giving a visual representation of gravity.  The idea of gravity has always been pretty easy for me to understand and easy to use in equations but where I begin to lose that understanding is when we leave earth and look at how it holds everything together.  How space is constantly expanding but these planets, moons and stars are constantly effecting each other.  In this video you get to see how gravity really makes these things work together to make space what it is.  The part I found coolest was when he explained and showed why all the planets are going around the sun the same way.  In this case it is clockwise and anything going the opposite way around the sun was or would be eliminated.  This was due to collisions and as he says, those going counter clock wise were not heading in the 'preferable direction'.



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