单词：hydrogen deficient star
单词：hydrogen deficient star 相关文章
Broadcast: February 14, 2003 By George Grow This is the VOA Special English Environment Report. President Bush has offered a plan to speed development of technology that uses hydrogen as fuel. His goa
VOA2003（上）-科技导航
Winking Star Six Centuries Ago Explained 揭秘600年前那颗一闪即逝的恒星 On March 11, 1437, Korean royal astronomers noticed something out of the ordinary in the night sky. There was a brand new star they'd never seen before, between two o
2017年Scientific American(九)月
Now the Sun will be burning hydrogen as the stars doing in the main sequence until the hydrogen is exhausted in the core, and at that point the stars start to die, the outer layer of the Sun will expand, the Sun will move away from the main sequence
探索与发现2015年
In India, stalled monsoon rains are expected to revive soon. But there are concerns the shortfall in monsoon rains so far could adversely impact crop production. Indian women harvest tea leaves at a plantation in Kondoli, some 17 km from Nagaon in t
VOA标准英语2009年(六月)
Scientists call it the Big Bang and it was predicted by the very same equations that discovered black holes.There is the Big Bang theory, according to which the universe began with a gigantic fireball on creation day, some 10,000 million years ago. I
探索与发现2015年
What makes the sun shine? For a lot of folks, this is the kind of thing that doesn't even require explanation: it just does. But just being a commonplace phenomenon in no way explains it. Something must cause the sun to shine. And, in fact, there is
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