NASA asteroid tracker: Look out for 820FT asteroid headed for Earth approach at 38,000MPH A COLOSSAL asteroid measuring up to 820ft in diameter will swing past the planet this week at speeds reaching 38,000mph, NASA’s asteroid trackers have revealed. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Australia lake turns BRIGHT PINK in strange natural phenomenon - visitors baffledSpace MYSTERY as ‘empty trash bag object’ orbits just 300 miles over EarthMount St Helens ‘BACK to life’ How scientists found magma RISING inside volcanoNew moon discovered on Neptune sparking calls for NASA mission to planetBioterror WARNING: Smallpox attack could be CATASTROPHIC for humanityWhy do Zebras have stripes? Scientists make staggering discovery that changes EVERYTHING