Computer-simulated Global View of Venus

How long a day lasts and where the sun rises and sets are impossible to forecast on one of Pluto's five moons, Nix. When NASA's Hubble Space Telescope observed odd changes in the sunlight Nix was reflecting, researchers realized that Nix does not rotate predictably like Earth's moon. Instead, it tumbles chaotically as it revolves around Pluto. Nix's erratic nature comes from orbiting a double planet: Pluto and its largest moon, Charon, which is about half Pluto's size. The two swing around each other like a dumbbell with unequal weights, shifting the gravity field that Nix experiences and tugging the potato-shaped moon in different directions about its axis. The same chaos afflicts Hydra, another tiny Pluto moon. Watch the video to see an animation showing Nix's wobbles as it orbits Pluto.

astronomy | space | system | solar | nasa | planet | moon | pluto

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Source: NASA's Goddard Space Flight Center Video courtesy of NASA/ESA/M. Showalter, SETI Institute/G. Bacon, STScI Images courtesy of NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute.
License: Public Domain. If you are going to redistribute this image online, a hyperlink to the above source page is mandatory.

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