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![]() Aaron J. CavosieThe Conversation |
Scientists thought this crater in Australia was the world’s oldest – but an independent analysis shows they might be off by 800 million years.
The discovery indicates water may have remained stable on Mars for much longer than scientists thought.
Water is ubiquitous on Earth – about 70% of Earth’s surface is covered by the stuff. Water is in the air, on the surface and inside rocks. Geologic...