
"My question is about the pictures taken on mars. Why does NASA change the coloring throughout the pictures to make them look red?"
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Early Oxygen

Cores retrieved from layers of deep-sea rocks that are 3.46 billion years old suggest that oceans contained abundant oxygen and that the atmosphere of the Earth was as rich in oxygen as it is today. The cores were obtained in northwestern Western Australia, and contain evidence that the deep ocean 3.46 billion years ago was so rich in oxygen that oxygen-producing organisms must have been actively producing it. This means that oxygen-producing organisms like cyanobacteria were present much earlier in Earth’s history than previously believed.Source: [Astrobiology Magazine]
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