NASA is monitoring a bus-sized asteroid that’s hurtling towards Earth at more than 38,500 miles per hour, according to the space agency's Center for Near Earth Object Studies (CNEOS). Estimated to span some 41 feet across, the space rock known as “2026 AZ2” is projected to make its closest approach today at a cosmically slight 217,000 miles from the Earth. 2026 AZ2 is not the only asteroid within the vicinity of our planet today. NASA is also tracking a plane-sized asteroid known as “2026 AR1”