Cassini Reveals Rhea in Eye-Catching Color

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online Cassini Reveals Rhea in Eye-Catching Color You're not seeing double; these are two images of the same world: icy, cratered Rhea, the second-largest natural satellite of Saturn. READ MORE 3D-Printed Violin Looks Like the Future of Music The same, but different. READ MORE WATCH VIDEO: 3-D Printing Robot Makes Homes Out of Mud Is there anything 3-D printers CAN'T do? See how far the technology has come. Porpoises Turn Sound Beams into 'Flashlights' to Hunt The animals can fine-tune the scope of their echolocation calls to broaden or narrow their search for prey. READ MORE WATCH VIDEO: The Amazing Link Between Bats and Dolphins Seeing with your eyes is so old school: Echolocation is where it's at. Why Trees Can't Grow on Mountaintops  What determines the elevation beyond which trees just can't get the job done? WATCH Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2015 Discovery Communications, LLC