06-18-2014, 06:36 AM
Sean Raymond is a remarkable and innovative planetologist; this is a very interesting article.
We have a thread already on this article here, by the way.
http://www.orionsarm.com/forum/showthread.php?tid=975
We have a thread already on this article here, by the way.
http://www.orionsarm.com/forum/showthread.php?tid=975