Books by Duncan G. Steel

About the author DUNCAN STEEL, Ph.D., is a research astronomer at the Anglo-Australian Observatory and a research fellow at the University of Adelaide, Australia. A world-renowned authority on the comet hazard, he has served on both the Detection Committee and the Intercept Committee created by NASA to assess the threat of comet and asteroid collisions and investigate technologies to avert such impacts. He writes regularly for Sky and Space magazine.