China's secretive space plane returns after 9-month orbit.

China's reusable space plane has landed after a 276-day flight in Earth's orbit, marking an "important breakthrough" in the country's research on reusable spacecraft technologies, according to Chinese state news agency Xinhua. The spacecraft's maker, China Aerospace Science and Technology Corp., has not released any details about the objectives of the flight or the specifications of the spacecraft. The Chinese space plane may resemble the X-37B space plane developed by Boeing for the US military, which has flown six times, with its longest mission lasting nearly three years.