Science World's most powerful rocket launches secret US satellite

The second classified mission for the National Reconnaissance Office to launch in nine days blasted off with the most powerful liquid hydrogen rocket engines ever built.  The spy agency plans a third launch in August. 

By , Space.com

ULA

A new spy satellite launched into orbit on a secret mission for the U.S. military Friday (June 29), roaring spaceward atop the world's most powerful rocket in use today.