When will the universe end?

Robert Frost famously noted that,"Some say the world will end in fire / Some say in ice." Lucky us! We're pretty sure we know the answer: it's ice. But how long do we have until the end of time, and what will it look like? In this week's "Ask a Physicist," we'll find out. » 10/29/13 9:00am 10/29/13 9:00am