15. Phobos-(named for one of
the horses that drew Mars'
chariot);
Deimos-(named for one of
Mars' companions). One of
the smallest natural satellites
in the solar system, its
surface displays numerous
craters.
18. Io-Satelliteof Jupiter; the
celestial body with the
greatest number of active
volcanoes.
Europa-Satellite of Jupiter;
displays a surface layer of ice
that might cover liquid
water.
19. Callisto-Satellite of Jupiter;
its heavily cratered surface
indicates that Callisto is very
old.
Ganymede-Satellite of
Jupiter; the largest natural
satellite in the solar system; its
glacial surface is thought to
cover an ocean and a mantle.
21. Titan-Saturn’s largest satellite,
1.5 times the diameter of the
Moon.
Rhea-Satellite of Saturn; its
cratered surface is covered with
ice as hard as rock.
Dione-Satellite of Saturn; its
cratered surface features ice
deposits.
22. Tethys-Satelliteof Saturn thought to
be composed of ice; visible on its
surface is an immense impact crater
named Odysseus.
Mimas -Satellite of Saturn; features
a crater named Herschel spanning
one-third of its surface.
Iapetus -Satellite of Saturn
featuring a bright side composed of
ice and a dark side composed of
unknown matter
25. Oberon-The most distant satellite
of Uranus; its craters are often
surrounded by light rays.
Titania-The largest satellite of
Uranus; its surface displays
numerous valleys and faults.
Umbriel-Satellite of Uranus; its
heavily cratered surface is very
dark.
26. Ariel-Satelliteof Uranus; its
cratered surface is composed of
numerous long valleys and
extremely high escarpments.
Miranda-Satellite of Uranus
whose surface is cratered in
places; displays vast expanses of
arêtes and furrows