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The space density of life-bearing primordial planets in the solar vicinity may amount to ∼8.1×104 pc−3 giving total of ∼1014 throughout the entire galactic disk. Initially dominated by H2 these planets are stripped of their hydrogen mantles when the ambient radiation temperature exceeds 3 K as they fall from the galactic halo to the mid-plane of the galaxy. The zodiacal cloud in our solar system encounters...
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