Labels:bulletin board OCR: But the fact that several pulsars are observed to have planets suggests that a reasonable fraction of the hundrec billion starsin our galaxy may also have planets The necessary planetary conditions for our form of life may therefore have existed from about four billion years after the Big Bang Our solar system was formed about four anda half billion vears ago or about ten billion vears after the Big Bang, from gas contaminated with the remains of earlier stars hundred
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