The world's space agencies are keeping close watch on an asteroid heading our way, because there's currently a 1 in 83 chance it will hit our planet in the next eight years. Asteroid 2024 YR4, as it's been designated, was flagged by the International Asteroid Warning Network (IAWN) for its potential to impact Earth on 22 December 2032.

YR4 might force NASA to plan the first-ever space mission to push an asteroid away from Earth. Most likely, though, it's a non-threat.