" PHP (isolated) = PAPuPvPiPMPePKP,.-" Pup (general) = PAPDPVPfPMPePRPLPB.

" PHP (isolated) = PAPuPvPiPMPePKP,.-" Pup (general) = PAPDPVPfPMPePRPLPB.

rotation. As was mentioned earlier, stars in the mass range 0.35 to 0.72 solar mass could have habitable planets, but only under the unusual circumstance that they also have a massive close satellite that maintains their rotation rate.

The probability that a star will have two habitable planets in separate orbits around it is quite small for stars with complete ecospheres—about 0.13 per cent. This probability decreases rapidly, however, for stars of less than 0.88 solar mass.

The probabilities of paired habitable planets and of two pairs of paired habitable planets in orbit around a single star are extremely small, but such configurations are not impossible. Four habitable planets (two pairs) around a single star is probably the maximum possible number, but this phenomenon is undoubtedly very rare.

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