I have heard that in 5 billion years the sun will enter its red giant stage and will eventually engulf Earth. I however think life will die off much sooner than that. In about 1 billion years the sun will become 10% more luminous raising Earths temperature much higher than today this might cause the oceans to evaporate and at that time i believe life will die off. Would that be right or would life continue on longer?
Pretend that Humanity left the solar system. Im talking about life in general.
7 months ago
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Your estimate may be more correct. Long before the red-giant phase of the Sun, its energy output will cause great excess heating of the Earth. I don't have a way to say it might not be 1.5 or 2 billion years, or even just 0.5 billion years. And we really don't have a firm forecast for solar output a billion years from now.
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It depends on how long the Earth's magnetic field lasts. I suppose you can rule out asteroid impacts and super volcano eruptions, since life has withstood those before. But if the Earth's magnetic field stops shielding the solar wind, then the Earth will literally be fried and it's unlikely life could withstand the radiation. Perhaps it might continue deep underground, but you wouldn't see any complex lifeforms.
The solar wind is more of a problem than a 10% increase in solar output--so no magnetic field = probably no life on Earth. Eventually, yes, the sun will sterilize and then likely completely destroy the Earth, but that amount of heating probably wouldn't happen until close to the red giant phase (so 4-5 billion years).
99% give or take, of all live on Earth would be dead in 600 Million years. In 800 Million years, multicellular live will die off since the sun is so bright, it evaporates and hardens rock, ending plate tectonics, trapping carbon dioxide underground, and kills off plants. 1.3 Billion years later, eukaryotic life dies out, leaving bacteria living on the Earth. Then the Earth is engulfed by the Sun during the red giant phase.
When the oceans boil dry and there is no no more groundwater. However, it not necessarily true that no water means no life. Read the article in the May 2013 issue of Scientific American about the scientific search for water on Mars.