No landing date yet for Air Force's mystery craftNovember 29th, 2011 in Astronomy & Space / Space Exploration
A secretive unmanned space plane is staying in orbit a little longer.
The experimental Air Force craft has been circling Earth for about nine months. The X-37B orbital test vehicle was due to land in California this week, but the Air Force said Tuesday that the mission will be extended. A landing date has not been set.
The plane resembles a mini space shuttle and is the second to fly in space. The first one landed itself last December at Vandenberg Air Force Base in California after more than seven months in orbit.
The Air Force has said the second mission was to further test the craft, but the ultimate purpose has largely remained a mystery.
©2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
"No landing date yet for Air Force's mystery craft." November 29th, 2011. http://phys.org/news/2011-11-date-air-mystery-craft.html