PASADENA, Calif., May 30 (UPI) -- Saturn's moon Dione, often thought of as a bland, smooth world, may have been geologically active in the past and may still be active now, U.S. astronomers say.
The evidence comes from instrument data and from close-up images of a 500-mile-long mountain on the moon captured by NASA's Cassini spacecraft orbiting the ringed planet, they said.