Earth crossing asteroidgeophysical catastropheorbital parameterorbitspeedimpact velocityasteroid diameter/ A9630H Asteroids A9635F Planetary masses, sizesgravitational fieldsThe mean collision velocity between an asteroid and the Earth is found to be 20.8 km s 1 . The standard deviation of the velocity ...
1What do scientists say about the collision of an asteroid with Earth? A. It is very unlikely but the danger exists. B. Such a collision might occur once every 25 years. C. Collisions of smaller asteroids with Earth occur more often than expected. D. w.c2cedu.com/zhuanti/kaobo/yingyu...
这个问题出现在文章的第二段,But there are also thousands whose orbits put them on a collision course with Earth.首先我们细细阅读这一部分,然后对比四个选项。通过对比四个选项,我们发现和原文内容最接近的是A选项It is very unlikely but the danger exists。这个选项是对原文内容的概括和总结:Experts think...
A. It is very unlikely but the danger exists. B. Such a collision might occur once every 25 years. C. Collisions of smaller asteroids with Earth occur more often than expected. D. It’s still too E. arly to say whether such a collision might occur. 相关知识点: 试题...
and Froeschlé, Ch.: 1996b, ‘The orbital evolution of the asteroid Eros and implications for collision with the Earth', Nature 380 , 689–691.Michel, P., Farinella, P., Froeschle, Ch., 1996b. The orbital evolution of the asteroid Eros and implications for collision with the Earth. ...
Earth to Narrowly Escape Collision with Asteroid 150 Feet Wide Friday (Posted 2013-02-14 17:09:29) ; Early Friday Afternoon, Planet Earth Will Be Buzzed by an Asteroid Some 150 Feet Wide, Identified as 2012 DA14, as It Intersects Earth's Orbit Just 17,500 Miles above Our Heads...
There was an asteroid, but it wasn’t threatening the Earth. And there was a spacecraft, relying on advanced technology from the Earth. The human heroes of the mission were actually at a physics and engineering lab between Baltimore and Washington, D.C. And there was a collision(碰撞). ...
The asteroids are very fragile, but when they are this large they may penetrate deep into the atmosphere and pose a real threat of collision with Earth, it added. The study urges further research to obtain "a better description of this real source of potentially hazardous objects large enough...
CAPE CANAVERAL, Fla. (AP) — Whew, now here's some good cosmic news: NASA has given Earth the all clear for the next century from a particularly menacing asteroid.
Scientists have predicted that an asteroid (小行星) could cinto the earth with the force of 22 atomic bombs on September 24, 2182. They have been trying to come up with effective ways to change its course so as to avoid a direct collision. 相关知识点: ...