What created the many elliptical Carolina Bay landform depressions and what caused the Younger Dryas cooling period 12,900 years ago?
Expert Panel Q&A Is it just me, or are asteroids more dangerous than they used to be? by Eric Christensen on April 8, 2016 share Eric Christensen is the director of the NASA-funded Catalina Sky Survey (CSS) and an Asteroid Day Expert. He answers a user submitted question. Do you have an asteroid related question? Submit it here. User submitted read more