Spacecraft kamikaze to defend earth
Can we intercept an asteroid that’s going to collide with the Earth?
Late one evening last year, an 87-year-old lady I know was out for a walk in the suburb where I live. As she waited to cross a busy road, a speeding car turned towards her, its headlights blinding her. She stepped back hurriedly. We don’t know quite what happened next, but she did fall on her back. When I reached the spot, she had been helped to her feet and was standing there in a daze. There was a wound on the back of her head, and small wounds on her shins. The surmise, thus, is that the car did hit her, at least gently.