VOA慢速英语 哈勃改变了我们对宇宙的概念

　　哈勃解释说，“星云”这一天文术语已经传下来几个世纪，用来描述太阳系以外永久性的云区。一些天文学家认为星云是银河系的一部分。其他人认为星云是太空中很远的地方的宇宙孤岛。

　　In his first observations from Mount Wilson, Hubble used a telescope with a mirror one hundred fifty-two centimeters across. He studied objects within our own galaxy. And he made an important discovery about nebulae.

　　在威尔逊天文台进行第一次观察时，哈勃用了直径52厘米的镜头。他研究了银河系以内的物体。关于星云，他做出了重大发现。

　　From nineteen twenty-two on, Edwin Hubble began examining more and more distant objects. His first great discovery was made when he recognized a Cepheid variable star. It was in the outer area of the great nebula called Andromeda. Cepheid variable stars are stars whose brightness changes at regular periods.

　　自从1922年起，哈勃开始研究距离更远的物体。他识别出造父变星，做出了第一个重大发现，在仙女座星云的外围区域。造父变星的光随着固定的周期变化。

　　Hubble then began to observe more details about galaxies. He studied their shape and brightness. By nineteen twenty-five, he had made enough observations to say that the universe is organized into galaxies of many shapes and sizes.

　　哈勃那时候开始观察星系的更多细节。他研究他们的形状和光芒。到1925年，他已经进行了足够的观察，可以说，宇宙由许多不同形状和大小的星系组成。

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