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Other Worlds - Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries by Garrett P. (Garrett Putman) Serviss
page 106 of 191 (55%)
heightens the impression. And the presence of the four satellites, whose
motions in their orbits are also evident, through the change in their
positions, during the course of a single not prolonged observation,
adds its influence to the effectiveness of the scene. Indeed, color and
motion are so conspicuous in the immense spectacle presented by Jupiter
that they impart to it a powerful suggestion of life, which the mind
does not readily divest itself of when compelled to face the evidence
that Jupiter is as widely different from the earth, and as diametrically
opposed to lifelike conditions, as we comprehend them, as a planet
possibly could be.

The great belts lie in latitudes about corresponding to those in which
the trade-winds blow upon the earth, and it has often been suggested
that their existence indicates a similarity between the atmospheric
circulation of Jupiter and that of the world in which we live. No doubt
there are times when the earth, seen with a telescope from a distant
planet, would present a belted appearance somewhat resembling that of
Jupiter, but there would almost certainly be no similar display of
colors in the clouds, and the latter would exhibit no such persistence
in general form and position as characterizes those of Jupiter. Our
clouds are formed by the action of the sun, producing evaporation of
water; on Jupiter, whose mean distance from the sun is more than five
times as great as ours, the intensity of the solar rays is reduced to
less than one twenty-fifth part of their intensity on the earth, so that
the evaporation can not be equally active there, and the tendency to
form aerial currents and great systems of winds must be proportionally
slight. In brief, the clouds of Jupiter are probably of an entirely
different origin from that of terrestrial clouds, and rather resemble
the chaotic masses of vapor that enveloped the earth when it was still
in a seminebulous condition, and before its crust had formed.
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