标签：捷克陨石 相关文章
This is a genuine iron meteorite, this is believed to have once been part of the core of a long dead planet or asteroid, and this was found right here in this strewn field, this remarkable little shapes, indentations on the surface are called thumbpr
探索与发现2014年
Steven Jabs search for remaining fragments, using a custom-built metal detector rig. Meteorites will have iron in them, and it's ? So not only will magneticbe attract to it, but also metal detector will be able to pick it up. Every year, over eightee
探索与发现2014年
But the friction and heat wears away at the space rock, the hot air actually melts the metal surface, and often the collision with the atmosphere can have a shattering effect, splitting the meteorites along fissures. This is an actual meteorite, and
探索与发现2014年
And above it the fragile air of the mesosphere is shielding us from a another deadly barrage from space. In east Texas, Jeff and Steve are searching for the remains of cosmic missiles that have been shattered by our atmosphere, fragments rarer than d
探索与发现2014年
[00:13.16]Wow, you look beautiful. 哇哦，你好漂亮 [00:15.36]So do you. I mean, handsome. 你也是，我是说，你很帅 [00:17.60]I mean... Sorry. I'm just a little frazzled. 我的意思是...抱歉，我有点累 [00:20.72]I just spent wa
听电影学英语-怪兽大战外星人
[全屏观看] 点击右键- 另存为 可保存这个Flash影片 作品简介 ： 操作方法：首先点游戏下方的放大按钮，开始按X+C键开始游戏，X键攻击，方向键控制女超人的移动。 游戏说明：地球又一次受到
英语魔法游戏
It's been tried all over the world, and teachers sort of stand back and say, It just happens by itself? 在世界各地尝试过，老师们后退着说：它就这么自己发生了？ And I said, Yeah, it happens by itself.How did you know that? 我说
TED演讲教育篇
Sixty-six million years ago, the meteorite, a rock over six miles wide, slammed into the earth and you know what happened next, the dinos disappeared. but Benjemin Blunder, a planty ecologist at the University of Arizona, says , consider the picture
2014年Scientific American(九)月
The super-duper 3-D big-screen Imaxed-out extravaganza that is Monsters vs. Aliens has bells and whistles, whiz and bang, sound and fury. It even has Reese Witherspoon. What it doesn't have is heart. . .or much of a story. Witherspoon voices a charac
英语时差8，16
What makes science really fun is when you get to do things yourself, so today were going to be making moon craters. 科学真正变得有趣的时刻就是当你亲自实践的时候，那么今天，让我们来一起制作月球陨石坑吧！ They
初学者听力文摘精选
Murchison Meteorite's Chemical Bonanza The 1969 Murchison meteorite was known to harbor complex organic compounds, but a new analysis in Proceedings of the National Academy of Sciences finds that it may also contain millions of chemicals and shed lig
60秒科学
Scientists Find Possible Meteorite Pieces in Ocean Scientists have found what they believe are pieces of a meteor that fell to Earth earlier this year. 科学家们已经发现他们所猜想的今年早些时候坠落到地球上的陨石碎片。 T
2018年VOA慢速英语(七)月
Firefighters battled throughout the night to extinguish the fire that began after the museum closed to the public on Sunday night. The 200-year-old institution which is part of Rio de Janeiros Federal University contained 20 million items including s
VOA标准英语2018年(九月)
A meteorite bursting through the atmosphere over Russia injuring hundreds of folks on the ground. It happened overnight in the fringe of Siberia, sending shock to residents into a state of panic. ABC's Current Rania filed this report just moments ago
万花筒2013年
It's clear from the fact that the Martian crust is strongly magnetized, that there must have been a magnetic field on Mars in the past, that the only way we know to magnetize rocks is for them to form in the presence of magnetic field. Why did Mars l
自然百科2011年
These are just the whole host of compounds we make. We found many of these compounds are very interesting because they play roles in life on earth. So, its clear we were making many the building blocks of life by these very processes that happened in
探索与发现2015年
6HighJump Whoisthat?saidJack. Idontknow，saidAnnie.Butwellsoonfindout!Shestartedwaving. No!saidJack.Hegrabbedherarm.Letsgobacktothebasebeforehegetshere! Why?saidAnnie. Wedontknowwhoheis!saidJack.Wedontknowifhesfriendlyormeanorwhat. Butwecantgoback，
汪培珽儿童英文分级书单《神奇树屋》
Scientists Debate, Prepare for Killer Asteroid 科学家们着手应对真实撞击地球小行星 NEW YORK Earthquakes, Tsunamis, Volcanoes. Now, add asteroids to the list of natural disasters that can threaten humanity and all life on our planet. F
VOA常速英语2013年(十一月)
There is no room to screw up on a trip like this, mental or otherwise. Once on Mars, you are likely to be stuck there for a year or more, waiting for a window of opportunity to ride home. And unlike a robot, the hopes and fears of the whole planet wi
自然百科2012年
But still be able to use your hands. Not only will you want to move your fingers, you want to move around. NASAs lunar electric rover is a prototype for future missions to the moon and Mars. Its part vehicle and part space suit. I can just picture be
自然百科2012年