When the Hubble telescope was launched into space in April 1990, the pictures it sent us were very disappointing because the main mirror was faulty. Four astronauts will soon be making the necessary repairs, and eventually, pictures from the Hubble will tell us a great deal about the age and size of the universe. (54 words)
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024