[地名] 赫克普特 ( 南非 )

小兄弟威胁着地球(2)

[6] One group, led by John Matese, professor of physics at the University of Louisiana at Lafayette, confirms the notion that it is most likely to be a brown dwarf, a star that never accumulated enoug

发表于:2019-01-26 / 阅读(188) / 评论(0)

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万物简史第31期:走进太阳系(9)

So the solar system is really quite enormous. By the time we reach Pluto, we have come so far that the Sunour dear, warm, skin-tanning, life-giving Sunhas shrunk to the size of a pinhead. It is little more than a bright star. 所以，太阳系确实是

发表于:2019-01-29 / 阅读(156) / 评论(0)

万物简史

万物简史第32期:走进太阳系(10)

Of course we have no prospect of such a journey. A trip of 240,000 miles to the Moon still represents a very big undertaking for us. A manned mission to Mars, called for by the first President Bush in a moment of passing giddiness, was quietly droppe

发表于:2019-01-29 / 阅读(148) / 评论(0)

万物简史

【英语时差8,16】奥尔特云与彗星

The Oort cloud is a spherical haze of comets that surrounds our entire solar system. We often get the false impression that the solar system ends with Pluto. In fact, beyond Pluto is the Oort cloud, encircling everything else like an enormous shell.

发表于:2019-03-06 / 阅读(203) / 评论(0)

英语时差8，16

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