A trio of secretive Russian satellites launched earlier this year has released a mysterious object into orbit, sparking interest among space trackers and analysts. The three satellites , designated Kosmos 2581, 2582 and 2583, launched on a Soyuz-2.1V rocket from Plesetsk cosmodrome early on Feb. 2 (GMT). Since then, the satellites, whose purpose is unknown, have displayed interesting behavior, while in a near-polar orbit roughly 364 miles (585 kilometers) above Earth . In March, the satellites appeared to be conducting potential proximity operations , or maneuvering close to other objects in space, according to Jonathan McDowell, an astrophysicist and spaceflight...