Wednesday, November 23, 2011

Natural satellite


Do you know??

A natural satellite is a natural object that goes around (orbits) a planet. It is usually called a moon and is large and ball-shaped. The Earth has only one moon. Some other planets have many moons, and some have none.

The Planets in Our Solar System and their natural satellites
Planet (or Dwarf Planet)
Period of Revolution Around the Sun
(1 planetary year)
Period of Rotation
(1 planetary day)
Mass
(kg)
Diameter
(miles
km)
Number of natural satellites
Mercury
87.96 Earth days
58.7 Earth days
3.3 x 1023
3,031 miles
4,878 km
0
Venus
224.68 Earth days
243 Earth days
4.87 x 1024
7,521 miles
12,104 km
0
Earth
365.26 days
24 hours
5.98 x 1024
7,926 miles
12,756 km
1
Mars
686.98 Earth days
24.6 Earth hours
=1.026 Earth days
6.42 x 1023
4,222 miles
6,787 km
2
Jupiter
11.862 Earth years
9.84 Earth hours
1.90 x 1027
88,729 miles
142,796 km
18 named (plus many smaller ones)
Saturn
29.456 Earth years
10.2 Earth hours
5.69 x 1026
74,600 miles
120,660 km
18+
Uranus
84.07 Earth years
17.9 Earth hours
8.68 x 1025
32,600 miles
51,118 km
15
Neptune
164.81 Earth years
19.1 Earth hours
1.02 x 1026
30,200 miles
48,600 km
2
Pluto (a dwarf planet)
247.7 years
6.39 Earth days
1.29 x 1022
1,413 miles
2,274 km
4

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