9—and now 8—planets of solar system

	click below to go to	Earth-Sun distnce=1	Radius Earth=1	Mass Earth=1	Number moons	orbital inclination	orbital eccentricity	obliquity	density (gm/cm³)
links to . . .	the Sun:	1	109	332,800	9	--	--	--	1.41
	Mercury:	0.39	0.38	0.05	0	7°	0.2056	0.1°	5.43
	Venus:	0.72	0.95	0.89	0	3.39°	0.0068	177.4°	5.25
	Earth:	1	1	1	1	0°	0.0167	23.45°	5.52
	Mars:	1.5	0.53	0.11	2	1.85°	0.934	25.19°	3.95
	Jupiter:	5.2	11	318	63	1.31°	0.0483	3.12°	1.33
	Saturn:	9.5	9	95	62	2.49°	0.056	26.73°	0.69
	Uranus:	19.2	4	17	27	0.77°	0.0461	97.86°	1.29
	Neptune:	30.1	4	17	13	1.77°	0.0097	29.56°	1.64
		39.5	0.18	0.002	4	17.15°	0.2482	119.6°	2.03
	1 AU = 93 million miles, the radius of the Earth’s orbit. Mass: the Sun is 1.3 million times the volume but only 330,000 times the mass of the Earth because its density is so low. "Orbital inclination" is the tilt of a planet’s orbit to the ecliptic. "Orbital eccentricity" (or orbital ellipticity) is how elliptical a planet’s orbit is (0 = circular, 1= a straight line). Mercury and Pluto, the inner and outermost planets, have the most inclined and most elliptical orbits. "Obliquity" is the tilt of a planet’s axis to its orbital plane. A spinning body’s spin axis never changes the direction it points in space as it orbits its parent body (explained on page 42 in You and the Universe), the principle by which gyroscopes (a spinning body) direct and stabilize vehicles in flight.

9—and now 8—planets of the Solar System