Apollo Mission Footprints Are Disappearing Faster Than We Thought

Meteor showers and cometary debris are kicking up lunar dust at rates much higher than initially assumed, producing towering clouds above the Moon’s surface. But what goes up must come down — meaning it’ll only be a matter of time before those iconic astronaut footprints will be gone forever. » 6/18/15 2:40pm 6/18/15 2:40pm