“Even if we intentionally push an asteroid away from Earth with a space mission, we must make sure it doesn’t drift into one of these keyholes afterwards. NASA’s DART MissionIn September 2022, the first successful asteroid redirection mission took place with NASA’s Double Asteroid Redirection Test, or DART for short. The Keyhole EffectGoing into the DART mission, NASA had little to fear from unintended consequences. Yet a different asteroid orbiting the Sun on a collision course with Earth could easily be sent through a gravitational keyhole back onto a direct collision course. Targeting an Asteroid DeflectionPrecision will be key in future deflection missions in light of the keyhole effect.