Question

谁知道有关自然，天文或宇宙或外星人的英文权威网站

我要做一个英文的演讲，想做关于自然界的谜团的话题。比如外星人拉，宇宙的奥秘，地球爆炸，等等的。

所以要引用一些“权威”的资料啊。各位帮忙。

Answer 1

http://www.nasa.gov/ 美国国家宇航局，这个应该是最权威的

http://www.heavens-above.com/

www.noao.edu，美国国家光学天文台

紫金山天文台的英文网站
http://www.pmo.ac.cn/English/index.htm

Answer 2

since you are perparing an english speech, an english website may be what you are looking for.

NASA and Discovery's Channel are good places to find whatever you're seeking, and Wikipedia as well. Their websites containts a lot of information about the nature and the universe. Just google them and you will find their urls.

Answer 3

中国天文网：http://astronomy.uua.cn/
中国UFO网：http://www.ufocn.org/

Answer 4

www.nasa.gov
aas.org