In 2020, The joint US-European Aida (which, as you undoubtedly know, is the Asteroid Impact & Deflection Assessment) will “send a small spacecraft to crash into the egg-shaped rock, known as Didymoon.” What for? Target practice. From the Independent: Scientists to nudge asteroid off course as practice for protecting the Earth. (Hopefully they won’t encounter too many political fights with Asteroid-deniers.)