February 14, 2017

"Presently, two X-37Bs are known to exist, with the first flying the OTV-1 and -3 missions and the second flying the OTV-2 and -4 (presumably) missions."

NASA Spaceflight: In all, each X-37B is 8.92 m (29 feet 3 inches) in length, has a 4.55 m (14 foot 11 inch) wingspan, has a height of 2.9 m (9 feet 6 inches), and has a maximum lift off weight of 4,990 kg (11,000 lbs). by Chris Gebhardt

'The vehicles are powered by gallium arsenide solar cells with Lithium-ion batteries and contain a 2.1 x 1.2 meters (7 feet x 4 feet) payload bay.

'In preparation for landing at Kennedy, teams practiced landing drills and post-landing safing operations as well as emergency drills at the SLF last week. The X-37B landing also helps explain the until now curious delay to SpaceX’s SpX-10 launch of the resupply mission for the International Space Station which had originally been scheduled for the 14th as well.

'While the secretive nature of the mission precludes any exact knowledge of the ground track the X-37B will take, a descending node reentry over large portions of the United States is the likely option given the landing window for the restricted air space in and around the Kennedy Space Center.

'If a descending node entry does occur leading up to an approximate 0748 EST landing at Kennedy, the X-37B could put on quite a light show for portions of the United States as it reenters the atmosphere in the early morning darkness before crossing the night-day Terminator and heading for a post-sunrise landing in Florida.'

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