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In every galaxy scientists looked at, they found evidence for a supermassive black hole. NGC 3115 NGC 3377 NGC 3379 In M31 and M32 In total there is probably 20-30 or so black holes that have been fou
发表于:2018-12-07 / 阅读(412) / 评论(0)
超大质量黑洞
超大质量黑洞
MICHEL MARTIN, HOST: Tomorrow, dozens of competitors will take to the slopes at Mount Snow in Vermont for the annual world championship of jack jumping. No judgment - we never heard of it either. So Vermont Public Radio's Nina Keck went to find out w
发表于:2019-01-16 / 阅读(111) / 评论(0)
2018年NPR美国国家公共电台3月
2018年NPR美国国家公共电台3月
DAVID GREENE, HOST: So here's a question - what do you do when a medical device fails? And when it fails, who pays for it - the manufacturer, the hospital? Or are you stuck with the bill? Well, Dr. Elisabeth Rosenthal from our partner Kaiser Health N
发表于:2019-01-23 / 阅读(93) / 评论(0)
2018年NPR美国国家公共电台12月
2018年NPR美国国家公共电台12月