彗星群

This is Scientific American's 60-Second Science. I'm Karen Hopkin. Thisll just take a minute. Any school kid can tell you that comets are made of ice. That frozen water burning off is what gives comets their characteristic tails. But asteroids were g

发表于:2018-12-02 / 阅读(181) / 评论(0) 分类 Scientific American(四)月

[00:00.00]Lesson 14 Comets [00:02.60]彗星 [00:05.20]In recent scientific investigation of comets has increased [00:14.16]because of a growing interest in the origin of the sun and planets. [00:17.63]近年来,由于对太阳和行星的起源兴趣

发表于:2018-12-08 / 阅读(134) / 评论(0) 分类 赖世雄学英语第四册

So, enough scientists in other disciplines are really asking people to help, and they're doing a good job of it. 足够多的科学家在其它领域正寻求大家帮忙,而且大伙也干的不错。 For instance, there's eBird, where amateur bir

发表于:2018-12-19 / 阅读(112) / 评论(0) 分类 TED演讲教育篇

This is Scientific Americans' 60-Second Science, I'm Chelsea Wald. Got a minute? Remember the good old days when we understood our solar system? Then we found out Pluto wasn't a planet. And now a new study puts comets in question. The data come from

发表于:2018-12-24 / 阅读(134) / 评论(0) 分类 Scientific American(一)月

This is Scientific American's 60-Second Science. I'm John Matson. Got a minute? Earth's surface is dominated by oceans. But where did all that water come from? Asteroids and comets smashing into the early Earth have long been thought to be a promisin

发表于:2019-01-08 / 阅读(157) / 评论(0) 分类 Scientific American(十)月

This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? The Apollo moon missions ended almost 40 years ago. But for lunar scientists, they're gifts that keep on giving. Researchers studying rocks brought back by ast

发表于:2019-01-08 / 阅读(154) / 评论(0) 分类 Scientific American(一)月

The Fourth of July fireworks started early. Scientists wearing red-and-blue shirts jumped up and down at the Jet Propulsion Laboratory here in California, upon receiving word from 83 million miles away that a comet had smashed into a NASA probe. The

发表于:2019-01-08 / 阅读(260) / 评论(0) 分类 2005年NPR美国国家公共电台

Comet 彗星 Do you know what a comet is? 你知道彗星是什么吗? A comet is an object in the solar system. 彗星是太阳系中的天体。 It travels around the sun like the planets. 它像其它行星一样绕着太阳转。 Then, why don'

发表于:2019-01-10 / 阅读(131) / 评论(0) 分类 与美国小学生一起学英文第11册

STEVE EMBER: Im Steve Ember. SHIRLEY GRIFFITH: And Im Shirley Griffith with EXPLORATIONS in VOA Special English. Today we tell about an American spacecraft that has a date with a comet. We hear the latest about a Space Shuttle commander whose wife co

发表于:2019-01-12 / 阅读(153) / 评论(0) 分类 2011年VOA慢速英语(二)月

Sleeping and Dreaming of Comets From VOA Learning English, this is Science in the News. Im Jim Tedder. And Im Caty Weaver. Today, we tell how sleep helps to keep our brains healthy. We have a report about what South African researchers are calling Ea

发表于:2019-01-12 / 阅读(215) / 评论(0) 分类 2013年VOA慢速英语(十一)月

ESA Spacecraft to Land on a Comet 欧洲航天局探测器登录彗星 After a long flight through deep space, a European Space Agency probe is finally approaching its target - a comet millions of kilometers away from earth. Scientists say the missio

发表于:2019-01-14 / 阅读(122) / 评论(0) 分类 VOA标准英语2014年(七月)

By Mike O'Sullivan Los Angeles 03 July 2006 A large asteroid, known as 2004 XP14, raced past the Earth early Monday. Scientists say it posed no threat to the planet, but serves as a reminder of the hazards encountered in space. -------- The rocky sp

发表于:2019-01-20 / 阅读(190) / 评论(0) 分类 2006年VOA标准英语(七月)

Itsremarkable how we are able to build up this picture of whats going on millionsof miles away in the solar system. Its one of the joys of science really, justalmost like a detective picking up on those tiny clues to tell a bigger story. Sothat the b

发表于:2019-01-23 / 阅读(149) / 评论(0) 分类 探索与发现2014年

Its been said that the first person on Mars is alive somewhere on earth today. Imagine its you. What do you need to know? How much you get there? What should you pack? What are some of the must-see sights and what should you avoid? Think of this as y

发表于:2019-01-26 / 阅读(134) / 评论(0) 分类 自然百科2012年

[6] One group, led by John Matese, professor of physics at the University of Louisiana at Lafayette, confirms the notion that it is most likely to be a brown dwarf, a star that never accumulated enoug

发表于:2019-01-26 / 阅读(154) / 评论(0) 分类 阅读空间

The Time Before Fire What is fire anyway? Well, fire is rapid oxidization . Its the energy released when oxygen atoms start combining with carbon and hydrogen atoms. Exactly, so without oxygen in the air, nothing burns. You mean there was a time befo

发表于:2019-01-26 / 阅读(117) / 评论(0) 分类 英语听力文摘 English Digest

But let's pretend again that we have made it to the Oort cloud. The first thing you might notice is how very peaceful it is out here. We're a long way from anywhere nowso far from our own Sun that it's not even the brightest star in the sky. It is a

发表于:2019-01-29 / 阅读(110) / 评论(0) 分类 万物简史

How to Motivate a Group I like to focus on receptive and expressive intelligence, which I call CQ. A healthy dose of CQ is essential when being in charge of a group or team because the task of motivating them often falls to you. This may seem unfair.

发表于:2019-02-08 / 阅读(231) / 评论(0) 分类 阅读空间

If you find yourself away from a city, spend an hour looking up on any clear, moonless night. You're bound to see a few brilliant shooting stars. These actually have nothing to do with stars: They're meteors, and if your viewing conditions are good,

发表于:2019-02-16 / 阅读(130) / 评论(0) 分类 英语听力文摘 English Digest

The Oort cloud is a spherical haze of comets that surrounds our entire solar system. We often get the false impression that the solar system ends with Pluto. In fact, beyond Pluto is the Oort cloud, encircling everything else like an enormous shell.

发表于:2019-03-06 / 阅读(160) / 评论(0) 分类 英语时差8,16
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