New research predicts Earth will lose its oxygen-rich atmosphere in about a billion years due to the Sun’s rising brightness. This change will drastically alter life conditions, making Earth uninhabitable for complex organisms. The study also challenges long-held beliefs about oxygen being a reliable sign of life on other planets.
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- Oxygen levels may crash in ~1 billion years
- Caused by Sun’s increasing brightness
- Brighter Sun breaks down CO2 in atmosphere
- Less CO2 means reduced photosynthesis
- Rapid oxygen drop could begin in ~10,000 years
- Complex life, including humans, won’t survive
- Ozone layer would collapse, UV protection lost
- Methane levels rise, atmosphere becomes toxic
- Anaerobic microbes may dominate again
- Calls for broader life-search criteria beyond oxygen




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