Astronomy Answers
Universe Family Tree: Planetary System


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  ┌──
moon
Type
: 
Star System
─── 
Planetary System
──┼──
Planet
        :               
  └──
Ring
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Size
: 
50,000 AU
─── 
0.1 AU
─────
12756 km
Earth
: 
the Solar System
─── 
the Earth System
─────
Earth

A planetary system consists of a planet and all things that orbit around the planet, such as moons and rings. The following table provides some information about the planetary systems in our Solar System. "Distance" is the average distance from the Sun, measured in astronomical units, "Year" the sidereal orbital period, "Moons" the number of known natural moons (on 2004-09-18, "Large Moons" the number of known moons with a diameter of at least 200 km, and "Rings" indicates whether the planet has rings.

Table 1: Planetary Systems in the Solar System

Planet Distance Year Moons Large Moons Rings
1 Mercury 0.39 88d 0 0 no
2 Venus 0.72 225d 0 0 no
3 Earth 1.00 365d 1 1 no
4 Mars 1.53 687d 2 0 no
5 Jupiter 5.20 11.87y 61 4 yes
6 Saturn 9.53 29.46y 33 9 yes
7 Uranus 19.18 84.01y 26 5 yes
8 Neptune 30.1 164.8y 13 3 yes



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Last updated: 2016-02-07