Don’t Panic, but NASA Is Tracking a Bus-Sized Asteroid Heading Towards Earth The asteroid is 23 feet in diameter. By Lauren Wellbank Published Sept. 23 2025, 3:07 p.m. ET Source: NASA/UnsplashA massive asteroid is heading towards Earth, and scientists say there is nothing that can be done to stop it. You can learn more about the massive asteroid headed towards Earth below, including what other flying debris has NASA's attention. Data shared by CNEOS shows the asteroid passing by during the evening of Sept. 23, 2025.