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当我们把脑袋探向天空时,肉眼只能见到大约6000颗恒星。大体上是南、北半球各能见到3000颗。如果使用望远镜,我们从一处看见的星星就可增加到大约5000颗;要是使用一台口径5厘米的小型天文望远镜,这个数字便猛增到30万颗;假如使用口径40厘米的天文望远镜,就不仅可以数恒星,而且可以数由几百亿颗恒星组成的星系了。要想探索宇宙的奥秘,没有天文望远镜可不行。
When we probe our heads to the sky, we can only see about 6,000 stars. In general, 3000 can be seen in each of the northern and southern hemispheres. If we use a telescope, we can increase the number of stars we see from one place to about 5,000; if we use a small telescope with a caliber of 5 centimeters, this number will soar to 300,000; if a telescope with a diameter of 40 centimeters is used, Not only can we count stars, but we can count galaxies made up of hundreds of millions of stars. There is no astronomical telescope to explore the mysteries of the universe.