Well it can't be people celebrating the super bowl, must be aliens lol. Athough, yes it probably is some sort of gov project. I use to live close to Hopkins airport in Berea, OH, USA. The local NASA used (which designed rocket engines btw) always claimed the loud noise was comercial jets.
Just remeber, if the world is coming to an end, many gov(s) have admitted that they would never let the public know.