If an asteroid were to head toward Earth, we would be quite defenseless, as we have not successfully developed a method that could reduce — or entirely avert — the impact of a devastating collision. However, that may be about to change. NASA has approved a project called the Double Asteroid Redirection Test (DART), the aim of which is to throw a "small" asteroid off course in October 2022. The asteroid in question, informally known as Didymoon, is a moon asteroid about 150 meters tall. It's part of a double asteroid system — named after the Greek word for twins, Didymos — in which it orbits another 800-meter asteroid about a kilometer away.
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