Hey sci-fi junkies and asteroid fanatics! Instead of watching "Armageddon" again tonight, you can direct your gaze to the heavens and watch a real asteroid the size of a city block zip past our planet. The hurtling space rock was discovered by Australia-based intergalactic space sleuth Rob McNaught and his colleagues, who spied the behemoth through a telescope earlier this week. Thankfully, they say there's no danger of the up to 2,300 foot wide rock smashing into us, but astronomers operating the Slooh Space Camera are excited that it will pass within 3.35 million miles of Earth, and they're hoping to catch it on camera. You can catch their live webcast here from 8:00 p.m