The U.S. Air Force's mysterious X-37B space plane is quietly chalking up mileage in space more than two months after its latest launch into orbit.
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While little is known regarding what OTV-3 is toting in its cargo bay, amateur skywatchers offer some insight into the mission.
"All does seem quiet," said Ted Molczan of Toronto, a leader in an ever-vigilant, worldwide satellite sleuthing network.
"OTV-3 remains in its initial orbit, maintaining altitude with periodic engine firings," Molczan told SPACE.com. "Unlike the first two missions, its ground track does not closely repeat at the frequent intervals that would suggest an imaging reconnaissance mission."
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