单词：Rosette Nebula
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This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. If youve ever wondered where the Earth came from, the answer, it seems, is blowin in the windthe solar wind. Or so say scientists who, after examining sola
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反射星云是靠反射附近恒星的光线而发光的，呈蓝色。反射星云的光度较暗弱，较容易观测到的例子是围绕着金牛座M45七姊妹星团的反射星云，在透明度高及无月的晚上，利用望远镜便可看到
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RACHEL MARTIN, HOST: If you go to the doctor with a painful problem, you will likely be asked to rate that pain on a scale of zero to 10, with zero meaning no pain at all and 10, the worst pain imaginable. But many doctors and nurses say rating by nu
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The Aeneid by Virgil 《埃涅阿斯纪》维吉尔 Mark first read the Aeneid while he was studying Latin in high school, and he recountedthe story of Aeneass quest and his desire to build a city that, he said, quoting the text in English, knows no
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The Aeneid by Virgil 《埃涅阿斯纪》维吉尔 Mark first read the Aeneid while he was studying Latin in high school, and he recounted the story of Aeneass quest and his desire to build a city that, he said, quoting the text in English, knows no
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It looks like a hand of God reaching out into the cosmos, but NASA says the display is caused by a young and powerful pulsar. Taken by NASA's Chandra X-ray observatory from it's orbiting 360 miles above the Earth, the recently released photo of Pulsa
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