Comet Enthusiast

More than three miles down in the Caribbean Sea, a remote-controlled vehicle has filmed the world's deepest "black smoker" vent: a gusher of iron sulfide so hot it could melt lead. "It was like wandering across the surface of another world," the geologist who piloted the vehicle told LIveScience. "The rainbow hues of the mineral spires and the fluorescent blues of the microbial mats covering them were like nothing I had ever seen before."