Solar System Comparison
(Includes recent moon count)
|Rotation on Axis
|MERCURY||3,032||59 days||0||36 million||3.2 minutes||88 days|
|VENUS||7,521||243 days||0||67 million||6 minutes||225 days|
|EARTH***||7,926||24 hours||1||93 million||8.3 minutes||365 days|
|MARS||4,222||24.6 hours||2||142 million||13 minutes||687 days|
|JUPITER||88,844||9.8 hours||63||484 million||43 minutes||11.8 years|
|SATURN||74,900||10.2 hours||61****||887 million||80 minutes||29 years|
|URANUS||31,764||17.9 hours||27||1.8 billion||2.7 hours||84 years|
|NEPTUNE||30,777||19.2 hours||13||2.8 billion||4.2 hours||164 years|
|PLUTO*****||1,429||6.4 days||3||3.7 billion||5.5 hours||248 years|
counts as of February 2011.
Expect the counts for Jupiter, Saturn, Uranus & Neptune to rise.
Over 200 moons of Saturn have been found but most of these moons have unstable orbits,
which means that they do not follow a consistent path around Saturn.
**Light travels at the speed of 186,282 miles per second.
Moon is 2,160 miles in diameter and revolves around the Earth every 29.5 days
at a distance of 240,000 miles.
****Astronomers have observed about 200 moons around Saturn but only 63 have stable orbits.
The remaining 140 are very small (34 are just 6 miles across) and are more like small asteroids
instead of something that we would call moons.
*****As of August 24, 2006, Pluto is no longer considered a major Planet.
It is classified as a Dwarf Planet and is one of the larger objects in an
outer debris field that starts beyond Neptune and is named the "Kuiper Belt."