[The last renewal of this page: April 18, 1999]

Distance from the Sun (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
-	0.387	0.723	1	1.523	5.202	9.555	19.218	30.110	39.540

The distance from the Sun to the Earth(149,597,870,000Km) is calld "1 AU" in astronomy. The farest planet, Pluto stays at 39.54AU, and is 5trillion 915billion Kilometers away.


Radiation from the Sun (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
-	6.6769	1.9130	1	0.4311	0.0370	0.0110	0.0027	0.0011	0.0006

The light and heat radiation from the Sun decrease in inverse propotion to the square 2 of the distance from the Sun.


Surface Temprature (in Centigrade)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
.	-170/430	450	15	-150/15	-150	-180	-210	-220	-240

As a result, the Pluto, the farest planet from the Sun has only -240 degrees. The Mercury does not have an atmosphere, and the temprature varies for 600degrees between day and night.


Diameter (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
109	0.383	0.949	1	0.533	11.209	9.449	4.007	3.883	0.178

The largest planet in the Solar System is the Jupiter, and is 11 times as large as the Earth.


Mass (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
332946	0.055	0.815	1	0.107	317.830	95.160	14.540	17.150	0.002

The Sun which has nuclear fusion activity has an extraordinary mass.


Density (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
0.255	0.984	0.949	1	0.712	0.241	0.125	0.230	0.297	0.386

Although the Jupiter has a mass 318 times as large as the Earth, its density is only a quater of
the Earth. This means the Jupiter consists of light chemical elements (Hydrogen 88%). The Jupiter
is awful planet consisting of a liquid hydrogen, no having a firm ground like other planets. If the
Jupiter had a mass 100 times as much as it is, it could be another Sun as a result of nuclear fusion
activity.


Rotation Period (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
25.449	58.809	243.678	1	1.029	0.415	0.445	0.720	0.673	6.404

While another Sun rise comes after the Sun rise on the Venus, about 244days will have passed on
the Earth.


Revolution Period (Earth=1)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
-	0.241	0.613	1	1.881	11.862	29.458	84.022	164.774	247.796

While another Spring comes after the Spring on the Pluto, about 248 years will have passed on the Earth.


Tilt of Axis/Obliquity (degrees)

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
7.25	0.00	177.40	23.44	25.19	3.10	26.70	97.90	27.80	120.00

Earth rotates almost horizontaly tilting a little(23.44degrees), but the Uranus rotaes almost verticaly falling over sideways.


Numbers of Satellites

Sun	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune	Pluto
-	0	0	1	2	16	18	15	8	1

With many planet-surveyers, a lot of new satellites have been discovered. The pluto has a satellite named Charon, which diameter(1,270Km) is almost a half of the Pluto(2,320Km).




The Mercury and Venus are revolving in the orbits inner than the Earth, and therefore, depending relative position from the Earth, they wax and wan like the moon.



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