The video was captured by a camera aboard the Space Shuttle
Discovery (Mission STS-48) between 20:30 and 20:45 GMT
on 15 September 1991 near the West Coast of Australia.

The objects appears at a point near the horizon and moves in a path that seems to follow the horizon. After a flash, the object abruptly changes direction and speed. This is followed a few seconds later by a streak that moves rapidly across the field of view and crosses the path of the object.

At the end of the event, the camera pitches down to reveal several objects moving below the shuttle. One of the objects has a triangular shape.

Within days Mr. Ratsch provided copies of his original recording along with detailed descriptions of four anomalous events to various investigators including NASA.

Comments under video
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Okay anybody who has watched any space travel movies or shows knows what this is its a propulsion station to jump ships into lightspeed the video on the right before it gets enlarged shows the ship beam a huge light source into the machine then the machine beams it back out at a traveling rate of lightspeed which is the beam that's thin. I'm not a rocket scientist or an engineer just a very observant civilian out here looking up!
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The DoD (Department of Defense) just came out and said this was a test of some type of laser "communication" system. So this is 100% legit footage but the real question is do you believe NASA and the DoD, or is it a cover up?
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Its a Experiment called Plasma Krystall - 4
Its microscopic.
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Do you really think that's what they were doing?
That's kind of scary when you think about.

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The space lab (designed and built at NASA’s Jet Propulsion Laboratory) operates when the astronauts aboard the ISS are asleep and is engineered to trap gas atoms, cooling them to temperatures just barely above absolute zero. It is here, in this level of cold, that the Bose-Einstein condensates come into existence.

Find out more about the Cold Atom Lab; why microgravity is so important when it comes to creating the coldest things; and how this ultracool state of matter comes to fruition in space on this episode of Focal Point.