Artwork showing the earth now (right) compared to how it might have looked around 2.4 billion years ago, before the great oxygenation event. The continents back there bear no resemblance to their modern counterparts; the atmosphere would have been thicker. | |
Licence : | Libre de droits |
Crédit: | Science Photo Library / Garlick, Mark |
Model Release : | Non requis |
Restrictions : | - |