The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . of Jupiter, and allthat we can observe must have their perihelionnot more than two or three times as far asthe earths orbit — otherwise they would be for-ever invisible. Their times of revolution varyall the way from three years to unknown thou-sands of years. Those having long periods gofar beyond the orbit of Neptune during theircourse. No limit can be set to their remark that the heavens may be asfull of comets as the sea of
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . of Jupiter, and allthat we can observe must have their perihelionnot more than two or three times as far asthe earths orbit — otherwise they would be for-ever invisible. Their times of revolution varyall the way from three years to unknown thou-sands of years. Those having long periods gofar beyond the orbit of Neptune during theircourse. No limit can be set to their remark that the heavens may be asfull of comets as the sea of fish, though prob-ably an exaggeration, is well fitted to give anidea of the possible number of these is certain that only an insignificant fractionof the total number has ever been seen by humaneye. See Comets. 5. The meteorites or meteors, which must becountless millions of millions in number, areso minute that we never see them individuallyexcept when they strike our atmosphere andform a shooting star. (See Meteors.) Theymay be classed with comets, because the latterare probably of meteoric constitution; perhapsmade up of SUN (OR ) and Side Virw-^ of llu Rrtlcclor. SOLAR SYSTEM A remarkable feature of the solar system isthe clear separation of the eight major planetsinto two groups, equal in numbers, each com-prising four planets with distinctive character-istics. The inner four, of which our earth isone, are dense and highly compressed solidbodies. The four planets of the outer groupare many times more massive than the innercncs, the least massive of all, Uranus, beingseven or eight times as weighty as the fourinner ones put together. As compared with theinner group, the planets of the outer groupare also distinguished by being larger in greater proportion than they are one of the inner group would be a smallobject alongside the smallest of the outer similarity of constitution also seems to markthe outer plan
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