Astrophysicist Caleb Scharf Digs Deep into 'The Zoomable Universe'

A new book by astrophysicist Caleb Scharf, "The Zoomable Universe," takes readers all the way from the size of the observable universe — as far as light can travel in 13.8 billion years — down to the shortest theoretical measurable length.

Space Dust Could Help Life Jump from Planet to Planet

Fast-moving dust could theoretically knock microbes floating high up in a world's atmosphere out into space, potentially sending the bugs on a trip to another planet — perhaps even one orbiting a different star, according to a new study.