标签：asteroid 相关文章
情景对话： Does he really live up there? I took basic astronomy and there was no mention of life, or children, on any other planets. Unless it's true that he came from a star, but that seems improbable. 知识点讲解： There was no mention of
2018年VOA慢速英语(一)月
Why Do Stars Twinkle? If youve ever glanced skyward on a clear evening, youve probably noticed with some wonderment the sheer numbers of stars. Some are tiny, barely visible points. Others radiate strong white light. And from our earthly vantage poin
英语听力文摘 English Digest
By Jessica Berman Washington 29 November 2006 The well-known scientific journal Science should require more information from authors, especially if their papers are likely to generate a lot of public attention. That's the conclusion of an independen
2006年VOA标准英语（十一月)
By David McAlary Was 16 August 2006 Artist's rendition of solar system There may soon be three new planets in our solar system. The expansion would be the result of a proposed new definition of what a planet is. The change is controversial, but if a
2006年VOA标准英语（八月）
New Director of Johnson Space Center Faces Cutbacks, Uncertainty When the U.S. space shuttle was still flying, the Johnson Space Center in Houston was a busy place. But now, all the shuttles are in museums and the Johnson Space Center has laid off hu
VOA标准英语2013年(二月)
Dawn Spacecraft Nears Rendezvous With Dwarf Planet Ceres 黎明号探测器成功将接近谷神星轨道 LOS ANGELES NASAs Dawn spacecraft is set to reach the dwarf planet Ceres in March and begin gathering clues about whether the icy body may have
VOA标准英语2015年(一月)
The Space Shuttle Atlantis and its four-person crew landed at the Kennedy Space Center in Florida just before dawn, bringing to a close a program that began in 1981 and leaving the United States temporarily with no vehicle to transport astronauts int
VOA双语新闻 2011年7月
Really, its a balance between the size of the object, its speed into the atmosphere and critically the altitude at which it explodes. Too high, if its too small and it explodes too high, the shockwave has little effect on the ground. If its quite low
探索与发现2014年
Oh, perfect, perfect, perfect. Now were seeing the fireball come in, its brighter than the Sun and then, Kapow, it hits the surface. Jeez! This whole region, downrange, would have been incinerated. It would have been incinerated just by this plasma,
探索与发现2014年
地球是太阳系从内到外的第三颗行星，也是太阳系中直径、质量和密度最大的类地行星。它也经常被称作世界。英语的地球Earth一词来自于古英语及日耳曼语。地球已有44～46亿岁，有一颗天然
英语听力文摘 English Digest
After Messenger's 3 fly-bys, we've now mapped more than 90% of the planet. Taken from around 124 miles, these images are the clearest to date of Mercury. And it's not hard to spot a crater of epic proportions, the result of yet another Titanic collis
自然百科2012年