Există o mulţime de teorii contradictorii şi plauzibile în acelaşi timp, dar majoritatea au un lucru în comun: stabilesc din start că totul s-a întâmplat pe Pământ.
Astrobiologii continuă să găsească indicii care sugerează că viaţa a apărut în altă parte a galaxiei şi a fost adusă pe Terra de meteoriţi şi comete, în urmă cu patru miliarde de ani, teorie cunoscută drept panspermie sau pangeneză. Spre exemplu, au fost descoperite molecule organice şi apă la suprafaţa cometelor care traversează sistemul nostru solar, aspect care arată că materialele necesare apariţiei vieţii pe Pământ provin din spaţiu. Unii merg mai departe şi spun că viaţa în sine a apărut în altă parte şi a fost adusă pe Terra, unde a găsit un mediu propice pentru a se dezvolta.
Descoperă teoria care distruge toate religiile
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