金沙官网手机版

Where does space begin? Here's why it's closer than you think

作者:蔺铍    发布时间:2019-03-03 07:12:06    

Drydon/NASA By Jonathan McDowell Space, as a famous Starfleet captain once said, is the final frontier. But where is the actual frontier? There are no customs posts as you leave Earth, and 50 years after the Outer Space Treaty, there is still no internationally agreed definition of where space begins. With growing interest in tourist trips to the edge of space,

 

Copyright © 网站地图