走遍全世界03:地球之外有生命吗？

Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scientists believed that life on other planets was just a hopeful dream. But now they are beginning to locate places where lif

太阳科普 第3期

The winter solstice events at Maeshowe demonstrate 梅萧韦古墓葬的冬至事件 an intimate and precise knowledge of 展现了古人 the sun's movements through the sky. 对太阳运行轨迹的精确了解 It was the first step on ourjourney to

太阳科普 第13期

When the sunspots disappeared something on the sun changed 太阳黑子消失时，太阳表面的变化导致 that cooled the Earth down. 地球温度降低 But it wasn't that the solar output changed. 改变的并不是太阳的输出量 No matter

日本在遥远的小行星上部署了跳跃机器人

Japan Deploys Jumping Robots on Distant Asteroid Two small Japanese robots landed on a distant asteroid last weekend. The robots took small jumps, making it the first time that any device from our planet has moved on the surface of an asteroid. The t

VOA慢速英语2018 帕克太阳探测器成为最接近太阳的航天器

Parker Solar Probe Becomes Closest Spacecraft to Sun The American space agency is reporting that its Parker Solar Probe now holds the record for the closest approach to the Sun by a human-made object. 美国航天局报告称，其帕克号太阳探测

太阳科普 第16期

The auroras dancing displays of celestial light 在天空中熠熠生辉的极光 are caused by particles from the solar storm smashing 是太阳风暴夹带的微粒 through the magnetic field at the poles. 撞击地球两极磁场的结果 When the

Drying Food

Broadcast: Jan 21, 2003 By Gary Garriott Drying food is a simple, low-cost way to keep food safe for eating. Drying removes water that small organisms use to break down food into other substances. Som

VOA慢速英语2014 罗塞塔航天器捕捉到一颗彗星

AS IT IS 2014-08-07 Rosetta Spacecraft Catches a Comet 罗塞塔航天器捕捉到一颗彗星 After a 10-year trip, a European spacecraft has, for the first time, entered an orbit around a comet. The European Space Agencys Rosetta spacecraft began a

“朱诺”飞船靠近木星

Spacecraft Moving in for Jupiter Close-up 朱诺飞船靠近木星 Jupiter, our solar systems largest planet, is about to show its secrets. On July 4, a NASA spacecraft will enter Jupiters orbit and start sending data back to Earth. It will be the fi

TED演讲:可能存在生命的三颗卫星和一颗行星(4)

A few months ago the fairy tale came true. 几个月前，童话故事成真了！ We announced to the world that we know what these streaks are. It's liquid water. 我们向世界宣布，我们已经知道这些条纹是什么了。是液态水。

英语听力：自然百科 地球力场 Earth's Force Field—1

The solar system is a hostile place. Earth is under attack from deadly cosmic radiation. Life here is only possible, because it's protected by the magnetosphere, an invisible force field that cocoons the planet. But new evidence reveals that this vit

英语听力：自然百科 地球力场 Earth's Force Field—2

Radiation causes damage at the most fundamental level. It mutates the blueprint of life, DNA. Earth's magnetosphere is our crucial defense. It's so fundamental to our evolution and continued existence that the race is on to understand why it's changi

英语听力：自然百科 地球力场 Earth's Force Field—16

During its magnetic cycle, the Sun undergoes periodic changes in activity. Every 11 years, it enters solar maximum. This 11 years cycle of solar activity has peaks where theres lots of solar storms. And right now where the sun is taking a little napp

英语听力：自然百科 地球力场 Earth's Force Field—5

If we could flip a switch and just turn off the Earth's magnetic field, it will take about 15,000 years to disappear, based on the rate of decay of the field that we've seen over the last 150 years. It's currently decaying at a rate that would see an

英语听力：自然百科 地球力场 Earth's Force Field—3

In polar regions where the magnetic field is / weakest, auroras glow in the sky. These dazzling displays of colored lights form when solar particles slam into gases in our atmosphere causing them to glow. The stronger the solar wind, the more dramati

PBS高端访谈:揭秘矮行星--谷神星的秘密

JUDY WOODRUFF: Let's look at a space mission that's generating lots of interest and excitement. It's the mission to orbit the dwarf planet Ceres by the NASA spacecraft named Dawn. It arrived in March, and as the spacecraft has gotten closer in recent

AGRICULTURE REPORT - Solar Food Dryers

AGRICULTURE REPORT - Solar Food Dryers By Gary Garriott Broadcast: Tuesday, March 01, 2005 I'm Gwen Outen with the VOA Special English Agriculture Report. Drying food is a simple, low-cost way to keep

MESSENGER Probe Sends First Mercury Images

The U.S. space agency(代理中介) has released the first ever image taken of the surface of Mercury from a spacecraft orbiting the planet. The black and white image, posted on the NASA website Tuesday, shows a surface pocked with craters of varying

Magnetic Bubbles Detected at Edge of Solar System

The latest data from the twin Voyager spacecrafts suggest the outer edge of the solar system is not smooth but filled with giant magnetic bubbles. Scientists say the turbulent bubbles are the result of the interaction between the Suns magnetic field

VOA常速英语2007年-Stem Cell Research Dominates 2007 Medical Field

By Jessica Berman Washington 19 December 2007 Stem cell research was the major medical and science story this past year, topping the list of achievements that experts say might finally lead to cures for many diseases. Meanwhile, global health officia