In the older days people thought that the Sun was a giant ball of burning coal. However, now we know that this is incorrect. The energy of the sun is produced at its core. At the core the temperature and pressure are so high that hydrogen is converted to helium. This nuclear fusion reaction results in the release of energy in the form of heat and light. So the Sun does not ‘burn’ as paper and wood burns. According to scientists, it will keep on shining for around 5 billion years more!
Most models suggest that as the oceans evaporate, more and more water will be present in the atmosphere instead of on the surface. This will act as a greenhouse gas, trapping even more heat and causing more and more of the oceans to evaporate, until the ground is mostly dry and the atmosphere holds the water, but at an extremely high temperature.
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