Callisto is a moon of the planet Jupiter, discovered in 1610 by Galileo Galilei. It is the third-largest moon in the Solar System and the second largest in the Jovian system, after Ganymede. It does not form part of the orbital resonance that affects three inner Galilean satellites—Io, Europa and Ganymede—and thus does not experience appreciable tidal heating. Callisto rotates synchronously with its orbital period, so the same face is always turned toward Jupiter. Callisto is composed of approximately equal amounts of rock and ices, with a mean density of about 1.83 g/cm3. Compounds detected spectrally on the surface include water ice, carbon dioxide, silicates, and organic compounds. Investigation by the Galileo spacecraft revealed that Callisto may have a small silicate core and possibly a subsurface ocean of liquid water at depths greater than 100 km. Prominent surface features include multi-ring structures, variously shaped impact craters, and chains of craters and associated scarps, ridges and deposits. Callisto is surrounded by an extremely thin atmosphere composed of carbon dioxide and probably molecular oxygen, as well as by a rather intense ionosphere. (more...)
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Q. I have installed a wiki on my site, but i (admin) want to be the only one who can edit the main page...while allowing the rest of the wiki to be edited...please help, any ideas?
Asked by WillisStevens - Fri Jul 18 12:04:24 2008 - - 1 Answers - 0 Comments
A. The best way to handle that is to move the wiki into its own directory and create a static html page that links into the wiki. Unfortunately its not possible to prevent people from editing just one page in Mediawiki.
Answered by Elpie - Fri Jul 18 12:18:10 2008
