英语听力：自然百科 金星和水星旅行指南 Venus and Mercury-5
时间：2019-02-05 作者：英语课 分类：自然百科2012年
英语课
Mercury's core makes up about 60% of the planet by mass. It's about twice as big as earth. Why would it have such a huge core for such a small planet? Some people think there was a huge impact.
Kind of stripped off a lot of the planet and now what we were seeing is just the remnants of a once bigger planet. Many questions about Mercury remain unanswered, questions a new mission will hopefully solve/.
Five, four, three, main engine start,
two, one and zero and liftoff of Messager on NASA's mission to Mercury.
NASA's Messenger Spacecraft will become the first probe to orbit / Mercury. Getting a spacecraft into orbit around Mercury is difficult for two reasons, the sun and the size, the sun as the source of heat and the sun as the source of gravity. To slip past the sun, Messenger/ taking a convoluted 1 route, flying past the earth once, Venus twice and Mercury itself three times to arrive in full- time orbit by 2011.
When you get into orbit, you can end up mapping the whole planet at fairly high resolution. So we will start having a mature and fundamental understanding of Mercury not only its surface, but its whole chemistry throughout the all planet. From that we can unravel 2 to some degree how it formed. What other secrets are edged into Mercury's ancient surface. Already Messenger has sent back some curious clues. Arriving in Mercury, there's a list of natural wonders to see, and even a dazzling light show.
adj.旋绕的；复杂的
- The snake slithered through a convoluted path.蛇在羊肠小道上爬行。
- The policy is so convoluted even college presidents are confused.这项政策太令人费解，甚至连大学校长们也是一头雾水。