NASA Cassini spacecraft snapped this image during the spacecraft closest flyby of Saturn moon Helene, on March 3, 2010. Helene is a Trojan moon of Dione, named for the Trojan asteroids that orbit ahead of and behind Jupiter.
NASA Cassini spacecraft snapped this image during the spacecraft closest flyby of Saturn moon Helene, on March 3, 2010. Helene is a Trojan moon of Dione, named for the Trojan asteroids that orbit ahead of and behind Jupiter.