Preppers, it's almost the big day you've been waiting for -- the apocalypse and armageddon all rolled into one. Almost, but not quite. According to NASA, "an asteroid about half the size of a football field will fly past Earth only 17,200 miles above our planet's surface." "This [will be] a record-setting close approach," says Don Yeomans of NASA's Near Earth Object Program at The Jet Propulsion Laboratory. "Since regular sky surveys began in the 1990s, we've never seen an object this big get so close to Earth." It'll be a close call and that's all. So, preppers, keep your compasses, iodine pills and dehydrated lentils packed and ready for another day. You'll get your chance.