Born 4.5 Billion years ago as a cloud of solidified dust and gases, Earth started its journey. Early signs of life started appearing shortly after the planet had cooled and liquid water became available. Life started colonizing and evolving with time, and resulted into the amazing complex animals we see today. On top of the hierarchy of this pyramid stands mankind, growing from apes to the technology driven Man; Humans have evolved immensely. The insatiable Human mind keeps searching for answers, out of these one that intrigues and worries us the most is how long our home will survive. When will Earth Die?
Some say the reason would be the source of our life; our Sun. Like every other creation Sun is believed to have a limited lifespan. Near about 5 billion years is all it has before it will burn the last of its hydrogen and in turn would consume Mercury and Venus and in turn would leave Earth inhospitable.
NASA repeatedly keeps reporting eruption of powerful X-class flare erupting on the sun, an indication that is Sun is heating up. The effect is minute right now but the amount of radiation would increase it’s just a matter of time. Resulting into a huge change in global temperature, scientists say it would reach a point when the oceans will start boiling.
At the core of the Sun, conversion of hydrogen to helium occurs in the presence of high temperature and pressure, making Sun denser and hotter with each reaction. Over the course of time in next billion years the amount of energy reaching from Sun would increase 10%. Though it appears too small with the sound of 10% but the effect would be humongous.
Ice caps will melt, water will boil away, and the resulting water vapours will in turn trigger greenhouse effect, increasing the temperature drastically and leaving the Earth dry and parched.
This will make life inhospitable on earth, forcing a reverse evolution, complex life forms will suffer first plants and animals will die off, leaving the invertebrates and eventually just microbial life. Life would end on the surface of the earth. But astonishingly microbial life would survive for billions of year as deep underground reserves would survive. Their life would end only with Sun may be. Perhaps they’ll experience that final baking when the Sun does reach the end of its life.
So we can conclude that solar heating is one of the big problems in our near future, a point that is stressed and agreed by many researchers and scientists. There are many other theories as well like the Big Crunch (opposite of Big Bang) or Heat Death of the universe or The Time Barrier, etc. But none validate and accurately explain the end. What is visible and by far should be our major concern is the Solar heating issue that directly will affect human life on Earth.
Though it seems to be a problem without possible solutions now but you never know, Human mind is capable of the unthinkable and it might survive even without a scratch!