The Economist @TheEconomist
“Asteroids of 140 metres or larger...would cause a regional scale disaster, meaning that it destroys the area of a small state.” Andrew Cheng of @JHUAPL explains the damage that NASA’s DART mission could help to avoid, on our “Babbage podcast” https://t.co/nSb0uZ2MYs https://t.co/4rsx3zEVVT — PolitiTweet.org