Is there a future for life on Earth? As we have discussed in class, the Sun has

Question

Is there a future for life on Earth?

As we have discussed in class, the Sun has brightened by 30% over the past 4.5 billion years, and will get brighter still during the next 4.5 billion years. The temperature of the Earth depends directly on the solar luminosity, so the Earth will heat up. There are feedback mechanisms that help maintain a more-or-less stable climate in Earth - witness the "faint young Sun problem". But feedback loops have their limits.

Your assignment: speculate about the far future. Where will human beings be in a billion years?

Explanation / Answer

most of the stars in the universe are main sequence stars in which hydrogen is converted to helium through nuclear fusion, when this stars turn in to a red giant its radius increases to millions of kilometers, and hence the solar radiation reaching the surrounding planets also increses and which increases the weathering of silicate minerals which reduces the amount of co2 in the atmosphere below the minimum level required for carbon fixation by trees and plants.this will leads to extinction of plants and this will leads to the extinction of animals too. so, the lives of human beings also at its end if there is no any technology that can over come this condition and it is possible only at the beginning of this temperature rise, because when sun become a red giant its size will reach up to the orbit of inner planets and it cannot survive by human beings. if the human beings transends to other outer planets lives can be extend more, other wise it will end up in the earth.

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