茫茫的广阔宇宙中,除地球之外,在其它星球上还有没有生命?特别是还有没有高级的有智慧的生命?这是长期以来人们感到兴趣和日益关切的问题。古代传说,上有九层天,居住着非凡的人。十八和十九世纪的近代科学家也曾预言,别的星球上居住有生物。现在,随着空间科学技术的发展,地外生命的探 In the vast expanse of the universe, there is no life on other planets besides the Earth, especially the high-level and wise life? This has long been a problem of growing interest and growing concern. Ancient legend, there are nine days, living with extraordinary people. Modern scientists of the eighteenth and nineteenth centuries have also predicted that there are other living beings on other planets. Now, with the development of space science and technology, exploration of extraterrestrial life