What's New in the Nine Planets
/new.html
2000 Oct 26: 4 new Saturnian moons. Announced by Gladman et al. 2000 Aug 22: official IAU names for 5 new Uranian moons. 2000 Jul 25: S/1999 J 1. New moon of Jupiter. 1999 Jul 31: two more Uranian. 1999 May 19: Uranus. S new moon 1986 U 10. 1998 Sep 16: The Nine Planets Bookstore. 1998 May 01: Uranus. S new moons named Caliban and Sycorax. 1998 Mar 05: Ice on the Moon. 1997 Nov 17: added Galileo images of Jupiter's 4 inner moons. 1997 Nov 03: two new moons. 1997 Oct 23: added 253 Mathilde. 1996 Apr 22: a...
Callisto
/callisto.html
Callisto seems to have little internal structure; however there are signs from recent Galileo data that the interior materials have settled partially, with the percentage of rock increasing toward the center. Callisto is about 40% ice and 60% rock/iron. Titan. Callisto has the oldest, most cratered surface of any body yet observed in the solar system; having undergone little change other than the occasional impact for 4 billion years. And Caloris Basin on Mercury. Detailed images from Galileo. Left) show...