Most people have no idea what they are seeing. I’m not sure what alien species we’re dealing with here, but it could be the Grays of the Zeta star systems. This is the antigravity force field in action; the electric field motor can be heard turning.
When the field rpm reached a certain level, Gray applied a DC voltage load to the tubular capacitors above the rotating Thorus field.
The higher the tension, the faster the take-off! On takeoff, a small burst of plasma from the carrier can be observed. In an antigravity force field, charged plasma ionized air is suspended. In our atmosphere, these amazing craft can fly at speeds of up to 30,000 miles per hour.
The grays were possibly aware that they had been noticed and weren’t sure how we, as primitive creatures, would respond.
We are delusional if we believe that Earth is the only world in the Universe with life. Not only are we not alone, but several alien species are currently residing among us. Others wish to take our place, while others are helping us in our transition to stage 2 civilization.