At 2.5 miles tall, Ahuna Mons sticks out like a sore thumb on Ceres. The ice volcano is by far the biggest thing on the dwarf planet, and there are no runners-up. It's Ceres' only ice volcano, and that's weird because, like legs, ants, and celebrity deaths, volcanoes usually don't occur alone. Now scientists think they may know why: the other cryovolcanoes were destroyed.
As you look at this photo, try to remember that every single pixel represents about a quarter-mile. This is just one short section of the outer B ring, which is perturbed by the nearby moon Mimas. Every time Mimas orbits Saturn, particles in this ring orbit twice, creating a periodic tugging motion that shifts the particles. The image has been cleaned up to remove blemishes so that you can appreciate the ring structure without underlying distractions.
Scott and Mark Kelly—NASA astronauts and identical twins—have given countless blood and saliva samples this past year as part of NASA's first twin study. According to the first findings announced by NASA, there certainly are differences between the twins' DNA. But understanding what those differences might mean is a long way off.
The sixties, like today, were a turbulent time. America was divided over the war with Vietnam, the Civil Rights movement was in full swing, and we were losing the space race with the Russians. Then, in 1962, President John F. Kennedy delivered one of the most epic speeches in history, challenging NASA to make it to the moon by the end of the decade. His call-to-action rallied the American people and lit a fire under the space agency, which resulted in Neil Armstrong and Buzz Aldrin walking on the moon in the summer of 1969.
In an image just released by NASA, Saturn's moon bears a striking but totally-not-disconcerting resemblance to a famous piece of sci-fi weaponry: The Death Star, a planet-killing behemoth recently brought back to life in "The Force Awakens". Insert your Star Wars joke of choice here. Rinse. Repeat.