DART approaching Dimorphos

This illustration depicts NASA's Double Asteroid Redirection Test (DART) spacecraft prior to impact at the Didymos binary asteroid system. On 26 September 2022 NASA’s approximately half-tonne DART spacecraft impacted the boulder covered Dimorphos asteroid at a speed of 6.1 km/s. This first experiment in the kinetic impact method of asteroid deflection was successful: observations from Earth show the 11 hour 55 minute orbit of Dimorphos around its parent asteroid Didymos was shortened by around 33 minutes (measured to an uncertainty level of plus or minus a minute).