Groundbreaking analysis of a distant, fast-moving comet has revealed new details in how asteroids form, shedding light on the formation of unusual shapes and, potentially, paving the way for more effective protection of the Earth from meteor impacts. The asteroid, Comet 67P/Churyumov-Gerasimenko, is around 2.7 miles across and moving at as much as 84,000 miles per hour, but scientists have …