NASA is currently monitoring a bus-sized asteroid set to zoom past the Earth on March 26 at a speed of around 23,197 miles per hour. The space rock—known as "2026 FB4"— is about 29 feet across and is set to make its closest approach to Earth tomorrow at a cosmically slight distance of just 404,000 miles, according to NASA's Jet Propulsion Laboratory ( JPL ). 2026 FB4 is not the only asteroid that will be in the vicinity of our planet this today. NASA is also tracking a house-sized asteroid