An image depicting an asteroid. — Nasa/FileWASHINGTON: A colossal explosion in the sky, unleashing energy hundreds of times greater than the Hiroshima bomb. A blinding flash nearly as bright as the Sun. Shockwaves powerful enough to flatten everything for miles.It may sound apocalyptic, but...from The News International - Sci-Tech https://ift.tt/aAotbP6