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https://www.bbc.com/news/science-environment-52560812 1000 light years away, 2 stars orbit "an unseen object every 40 days"; it would take a mass 4 times the mass of our Sun to make those stars orbit like that; the object cannot be seen, thus, it must be a black hole. ~ The 16" x 6.75" watercolor art for today's A* page is https://www.ebay.com/itm/143598103339