It’s been around the web a few million times, but we’ve gotten a handful of tips regarding Discovery HD’s beautifully done 3D simulation showing Earth’s destruction by a massive asteroid impact. With soundtrack provided by Pink Floyd, you watch as the impact creates massive destruction, followed by a flowing wall of superheated air and gases which circumvents the globe, roasting most, if not all living things to a crisp. This video should make quite a few 12.21.2012 believers salivate with apocalyptic fervor!