"Massive Stadium-Sized Asteroid's Closest Approach to Earth Today: How to Watch"

The "potentially hazardous" asteroid 2008 OS7, about the size of a football stadium, will make its closest approach to Earth in over 100 years, passing by at a distance of 1.77 million miles. Despite its classification, it poses no threat of impact. NASA has identified around 25,000 potentially hazardous asteroids, with one expected to hit Earth every 20,000 years. The asteroid's highly elliptical orbit causes its distance from Earth to vary widely during close approaches.