If it’s hard to wrap your mind around the concept of black holes, watch this video. Star S2, the closest star to the center of the Milky Way, gets whipped around by … something.
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S2 takes 15 years to orbit around the super-massive black hole at the center of our home galaxy. At its closest, it gets within one light day – about twice the size of the orbit of Neptune – of the black hole. The black hole – designated Sagittarius A* – is believed to be more than 3.7 million solar masses in mass.
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