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The Solar System

Moving outwards from the Sun. Figures approximate.

Planet Diameter in Length of    Length of No. of

	Miles	Year	Day	Moons
Mercury	3,100	88 days	88 days	?
Venus	7.750	224 days	?	?
Earth	7,900	365 days	24^hours	i
Mars	4,200	687 days	24 hours	2
Jupiter	86,700	12 years	10 hours	11
Saturn	71,500	30 years	10 hours	10
Uranus	32,000	84 years	11 hours	5
Neptune 31,000		164 years	16 hours	2
Pluto	7,500	248 years	?	?

About 2,000 minor planets (planetoids) with orbits mostly between Mars and Jupiter. The largest are Ceres, Pallas, Vesta and Juno, with diameters of between one hundred and five hundred miles. Five hundred have diameters of morę than thirty miles.

The increasing lengths of the years is because of the increasing distance from the Sun, resulting in a ionger joumey which the planet must make round it.