1.GANYMEDE/JUPITER
5,262.4/3,269.9
Discovered by GALILEO on 11 January 1610, Ganymede is thought to have a surface of ice about 97 km(60 miles) thick. Launched in 1989, NASA's Galileo probe reached Ganymede in June 1996. NASA thinks it has found a moon with a subterranean salt-water ocean. And this time, it's not on Europa. It's on Ganymede, Jupiter's largest moon. They made this discovery using the Hubble Space Telescope, which, interestingly enough, can't see underwater.
2.TITAN/SATURN
5,150.0/3,200.1
RADIUS : 2,574.7 km
SATELLITE OF : Saturn
SURFACE PRESSURE : 146.7 kPa (1.45 atm)
ORBITAL PERIOD : 15.945 d
SURFACE AREA : 8.3×107 km2 (0.163 Earths) (2.188 Moons)
TEMPERATURE : 93.7 K (−179.5 °C)
Titan is more significant than Mercury and Pluto. We have no idea what its surface looks like because it has such a dense atmosphere. Still, radio telescope observations suggest that it may have ethane 'oceans' and 'continents' of ice or other solid matter.
3.CALLISTO/JUPITER
4,820.6/2,995.4
Radius:2,410.3 km
Gravity: 1.236 m/s²
Discovered: 7 January 1610
Surface area: 7.30×107 km2 (0.143 Earths)
Discovers: Galileo Galilei, Simon Marius
Possessing a similar composition to Ganymede, Callisto is heavily pitted with craters, perhaps more so than the body in the Solar System.
4.IO/JUPITER
3,642.6/2,263.4
Radius: 1,821.6 km
Orbital period: 42 hours
Gravity: 1.796 m/s²
Discovered: 8 January 1610
Dimensions: 3,660.0 × 3,637.4 × 3,630.6 km
Io has a crust of solid sulfur with massive volcanic eruptions in progress, hurling sulfurous material 300 km (186 miles) into space.
5.MOON/EARTH
3,476.2/2160.0
Our satellite is a quarter of the size of the earth. The 5th largest in the solar system and to date the only one to have been explored by humans.Moon! Earth's Best Friend is a light-hearted nonfiction picture book about the formation.
6.EUROPA/JUPITER
3,121/1,939.
Radius: 1,560.8 km
Orbital period: 3.551181 d
Gravity: 1.315 m/s²
Discovered: 8 January 1610
Surface area: 3.09×107 km2 (0.061 Earths)
Although Europa's ice-covered surface is smooth and crafter-free, it is covered with mysterious black lines, some of them 64km(40 miles) wide and resembling canals.
7.TROTON/NEPTUNE
2,706.8/1,681.9
Radius: 1,353.4 km
Orbital period: 141 hours
Temperature: 38 K (−235.2 °C)
Discovered: 1846
Surface area: 23,018,000 km2
Triton is getting progressively closer to Neptune, and it is believed that in several million years, the force of the planet's gravity may pull it apart, scattering it into a form like the rings of Saturn.
8.TITANIA/URANUS
1,577.8/980.4
Radius: 788.4 km
Orbital priod: 209 hours
Orbits:Uranus
Surface area: 7820000 km2
Surface gravity: 0.379 m/s²
Surface pressure: <1–2 mPa (10–20 nbar)
Discovered by:William Herschel
The largest of Uranus's 27 moons, Titania, was discovered by Willian Herschel on 11 January 1787. It has a snowball-like surface of ice. Data from Voyager 2 revised its size estimate.
9.RHEA/SATURN
1,528.0/947.6
Surface gravity: 0.264 m/s²
Mass: (2.306518±0.000353)×1021 kg (~3.9×1...
Surface area: 7337000 km2
Average orbital speed: 8.48 km/s
Radius:475 miles (764 kilometers)
Saturn's 2nd-largest moon was discovered in 1672 by Jean-Dominique Cassini. Voyager 1 confirmed that its icy surface is pitted with craters, one of the 225km(140 miles)in diameter.
10.Oberon/Uranus
1,522.8/946.2
Mean radius: 761.4±2.6 km (0.1194 Earths)
Surface area: 7285000 km2
Temperature: 70–80 K
Orbital period: 13.463234 d
Satellite of:Uranus
Discovered by:William Herschel
Surface gravity: 0.346 m/s²
Herschel discovered Oberon at the same time as Titania and was given the name of the fairy king, husband of Queen Titania. Data from Voyager 2 relegated Oberon from 9th to 10th place in this list.
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