Credo che la spiegazione l'abbiano data diversi utenti, questo di recente:
I hate to break it to everyone, but these two lights are artillery Illumination rounds. They are fired into the air via ship canons or artillery tubes. They hit a specific altitude and burst into action. There is a parachute associated with them but would be hard to see. If not a parachute, then a platform for slowing the round that is carried by the winds until burn out. I have dealt with them too many times in Iraq, and Afghanistan. I have 22 years as a retired military aviation officer, and 6 years as an over-seas contractor in two different war zones. I say this to keep the integrity of the group as I do believe there are UFOs to be found and reported, however, this sighting can be easily explained. Keep up the search....
In sintesi, si tratta di illuminazioni a scopo militare, chi scrive riporta la sua esperienza come militare in Iraq e Afghanistan e il confronto è identico.
Mentre il mio personalissimo parere è che non credo che 4 pirla siano in grado di causare un evento in stile Dragon Ball