The number-versus-mass distribution for the planets of the solar system also exhibits a pattern of regularity. The smaller individuals among the planets are more numerous than the larger ones, as is the case with stars, asteroids, and meteorites. This is apparent from Figure 10 (see page 33). Under the assumption that the planets of our solar system represent a fair sampling of such objects, it is now possible to construct a probability
HABITABLE PLANETS FOR MAN Table 13. Probability That a Planet Orbits within an Ecosphere
Spectral Mean Lumi- inner, outer, class mass nosity D1 D2 D2lD1 Pn
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