New satellites come up from the left and red laser beams measure the distance and speed of the existing batch of satellites which are setting in the Earth's horizon as a vertical line of dots here. The satellites launched and the satellites setting both move too fast to be real so this video is speeded up. Has to be a special camera to film this since those red laser beams are narrow and should not be easily detectible from ground. So it's possible they could have been added afterwards between two lines of white dots flying in the sky. Nice dance. 💃✨✨