Also see: "Is Humanity About To Accidentally Declare Interstellar War On Alien Civilizations?" https://www.forbes.com/sites/startswithabang/2018/08/07/is-huma

Also see: "Is Humanity About To Accidentally Declare Interstellar War On Alien Civilizations?" https://www.forbes.com/sites/startswithabang/2018/08/07/is-humanity-about-to-accidentally-declare-interstellar-war-on-alien-civilizations https://www.forbes.com/sites/startswithabang/2018/08/07/is-h... "aiming to the level-of-precision needed to pass close to (but not collide with) a target planet is virtually impossible. The “cone of uncertainty” for any trajectory will include the planet we’re aiming for." "A planet getting hit by a ~1 gram spacecraft moving at 60,000 km/s is going to experience the same level of catastrophic effects as a planet getting hit by a ~1 tonne asteroid moving at ~60 km/s, the equivalent of which happens on Earth just once per decade. Each strike would hit their world with the same energy that the Chelyabinsk meteorite struck Earth: the most energetic collision of the decade."