When it comes to real footage of UFOs film from the 1991 NASA STS-48 Discovery Space Shuttle mission definitely ranks as some of the best. This footage is real and well documented, and has been the subject of rigorous scientific investigation by multiple researchers and institutions.
The video above shows as many as a dozen objects moving in an unusual fashion. Apart from that, the most fascinating moment is when we see one object at a point near the horizon, as a flash occurs, the object shoots off into space. The objects speed before accelerating into space is estimated at 87,000 kph. After it changes direction and accelerates off into space it is estimated to of reached 340,000 kph in 2.2 seconds. Such an acceleration would produce 14,000 g of force.