5 January 2012 Updated at 06:46 ET
Jonathan Amos
Science correspondent
X-37B spaceplane 'spying on China'
X-37B - American military spaceplane
Mission: Described as a re-usable testbed for new sensors and other space technologies
Length: 9m (29ft); Wingspan: 4.5m (14ft); Height: 3m (9.5ft); Mass: 5t (11,000lb)
Origins: Started as a Nasa project in 1999 before being handed to the military in 2006
Flight history: First vehicle launched in April, 2010, and landed eight months later
Cost: The budget line for the X-37B programme continues to be classified information
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America's classified X-37B spaceplane is probably spying on China, according to a report in Spaceflight magazine.
link-
http://www.bbc.co.uk/news/science-environment-16423881