一名13岁的小男孩正在做家庭作业时，他听到了有关入侵的第一次新闻快讯。

　　[句型点拨]be doing sth.when ... "正在做某事，这时......"。

　　[佳句赏析]她正沿着河岸走，这时她听到呼救声。

　　She was walking along the bank of the river when she heard a cry for help.

　　Secrets of the Gas Giant

　　The Cassini­Huygens space probe, which reached Saturn last week, has sent back amazing photographs of the planet's famous rings viewed in ultraviolet light. The pictures show them in shades of blue, green and red. The different colours show exactly what the rings are made of: the red means the ring contains tiny pieces of rock and the blue and green is likely to be a mixture of water and frozen gases. Saturn itself is made of gases. It is so light and it could float on water - if a big enough ocean could be found!

　　The probe is an international project to explore the planet and its rings and moons. It was launched in 1997 and its mission was to explore the "gas giant" planet which is the furthest planet to be seen from the Earth without a telescope.

　　Scientists say the spacecraft's four­year tour of Saturn may tell them how the rings are formed. It will also study the planet's atmosphere and magnetic field.

　　The probe has sent back pictures of some of Saturn's moons, including tiny Phoebe, which has a strange shape - unlike other planets and their moons, it is not perfectly round - and Saturn's biggest moon, Titan, which is believed to be the only body in the solar system other than the Earth with liquid on the surface.

　　The images of Titan and Phoebe look strangely like photos of the Earth and our own Moon, taken decades ago by the earliest space missions. They are so clear that it is easy to forget they are coming from a distance of one­and­a­half­billion kilometres.

　　巨型气体的秘密

　　上周到达土星的"卡西尼·惠更斯"号太空探测器已发回了著名的土星光环的照片，这些令人惊奇的照片是在紫外线下拍摄的。这些照片显示了它们在蓝色、绿色和红色阴影下的光环。这些不同颜色确切地表明了土星光环的组成部分：红色意味着光环中含有微小的岩石颗粒；蓝色和绿色可能是水和冰冻气体的混合物。土星本身是由气体构成的。它非常轻并且能够浮在水面上--如果能找到一个足够大的海洋。

　　这个探测器是一项国际性的工程，目的是探索这一行星及其光环和卫星。探测器于1997年被发射，其任务是探索这个"巨型气体"星球，它是我们从地球上不用望远镜所能看到的最远的行星。

　　科学家们说这个航天器为时4年的土星之旅可能会告诉我们这些光环是如何形成的。它也会研究土星的大气层和磁场。

　　探测器还发回了土星的几颗卫星的照片，其中包括形状奇特的小个子土卫九--跟其他行星和卫星不同的是，它没有那么圆--还有土星最大的卫星，土卫六，人们都认为那是太阳系中除了地球以外唯一表面有液体的星体。

　　数十年前由最早的航天任务拍摄的土卫六和土卫九的照片看起来很奇怪，就像地球和我们的月球的照片。它们是如此清晰以致很容易让人们忘掉它们是来自15亿千米之外的地方。

　　May the Force Be with You

Star Wars is a series of science fantasy films. The six­film series began in 1977, and has a world­wide audience, with films, books, video games, television series and toys. It is now acknowledged by the movie industry as the most successful film series ever.