The Day the Sky Flashed Twice: What Caused the Mysterious Vela Incident? Azar 22, 1396 AP · On September 22nd 1979, the sensors aboard the US Vela Satellite picked up a distinctive signal ... Duration: 8:29 Posted: Azar 22, 1396 AP https://www.youtube.com/watch?v=3asnLWPBoKY