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Moon Formation: ring around the earth
auteur: Ron Miller/Novapix
référence: a-lun99-00017
Image Size 300 DPI: 35 * 35 cm
4.5 billion years ago. After Theia collision and for a short time, the earth is surrounded by a ring of debris. The ring is only temporary, however: it soon begins to coalesce into a solid mass. Only a few years might have been required for it to form into a moon.
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