Asteroid 2004 BL86 was discovered on Jan. 30, 2004. This will be the closest it will come to Earth for the next 200 years. NASA will try to collect science data a detailed images using radar. Get your telescopes and strong binoculars ready to try and catch a glimpse as it passes. Learn more about Asteroid 2004 BL86 and see NASA’s animation simulating the passage of the asteroid here.