标签:克里斯·埃文斯 相关文章
1. The canoe was now approaching the land. The man with the carved paddle stopped. It should be somewhere here, he said. The other man had been in the fore part of the canoe, closely scrutinising the land. He had a sheet of yellow paper on his knee.
Education Report - Getting a Free Education, in Huge Online Classes 教育报道 - 通过网上开放课程免费获得教育 This is the VOA Special English Education Report. 这里是美国之音慢速英语教育报道。 A class with tens or even
About 4.6 billion years ago, a great swirl of gas and dust some 15 billion miles across accumulated in space where we are now and began to aggregate. Virtually all of it99.9 percent of the mass of the solar systemwent to make the Sun. Out of the floa
It was he who coined the term Big Bang, in a moment of facetiousness, for a radio broadcast in 1952. He pointed out that nothing in our understanding of physics could account for why everything, gathered to a point, would suddenly and dramatically be
Supernovae are significant to us in one other decidedly central way. Without them we wouldn't be here. You will recall the cosmological conundrum with which we ended the first chapterthat the Big Bang created lots of light gases but no heavy elements
The question that naturally occurs is What would it be like if a star exploded nearby? Our nearest stellar neighbor, as we have seen, is Alpha Centauri, 4.3 light-years away. I had imagined that if there were an explosion there we would have 4.3 year
Looking for supernovae is mostly a matter of not finding them. From 1980 to 1996 he averaged two discoveries a yearnot a huge payoff for hundreds of nights of peering and peering. Once he found three in fifteen days, but another time he went three ye
The reason we can be reasonably confident that such an event won't happen in our corner of the galaxy, Thorstensen said, is that it takes a particular kind of star to make a supernova in the first place. 索尔斯坦森说,有理由相信,这种事
At this point, about 4.5 billion years ago, an object the size of Mars crashed into Earth, blowing out enough material to form a companion sphere, the Moon. Within weeks, it is thought, the flung material had reassembled itself into a single clump, a
Surprisingly little of the universe is visible to us when we incline our heads to the sky. Only about 6,000 stars are visible to the naked eye from Earth, and only about 2,000 can be seen from any one spot. With binoculars the number of stars you can
Interestingly, Zwicky had almost no understanding of why any of this would happen. According to Thorne, he did not understand the laws of physics well enough to be able to substantiate his ideas. Zwicky's talent was for big ideas. OthersBaade mostlyw
On January 15, 1934, the journal Physical Review published a very concise abstract of a presentation that had been conducted by Zwicky and Baade the previous month at Stanford University. 1934年1月15日,《物理学评论》杂志刊登了一篇论
But Zwicky was also capable of insights of the most startling brilliance. In the early 1930s, he turned his attention to a question that had long troubled astronomers: the appearance in the sky of occasional unexplained points of light, new stars. 然而
Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文,请发贴到 听力原文收集区 ,您将会获得10到30积分的奖励! Thank you!
编者按: 我相信善可以压倒恶,并发现如果我们完全相信善的力量,便能以善除恶。 这样的认识在压迫和暴政时期给人巨大的力量。我相信仇恨有毁灭性的力量,热爱人民、民族或思想总是不
A new non-proliferation group warns the world is on the brink of a massive increase in nuclear weapons. The global organization has spent the past two days in Sydney looking at ways to strengthen international agreements to halt the spread of nuclear
Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文,请发贴到 听力原文收集区 ,您将会获得 10 到 30 积分的奖励 ! Thank you !
[00:00.00]Lesson 5 [00:03.29]Tom:Kick the ball,Sandy! [00:05.07]汤姆:桑迪,踢球啊! [00:06.84]Sandy:All right,Tom. [00:08.37]桑迪:好的,汤姆. [00:09.90]Tom:Look,Sandy! [00:11.48]汤姆:留神,桑迪. [00:13.06]Mr Crisp:Oh! [00:14.24]克里斯
[00:00.00]Lesson 1 [00:45.79]Narrator:Meet Sandy and Sue! [00:48.33]旁白:来见见桑迪和苏. [00:50.86]Narrator:This is Sue's class. [00:52.48]旁白:这是苏的班级. [00:54.10]Narrator:Her teacher's Mr Crisp. [00:56.42]旁白:她的老师是克