βIn this process of the sun becoming a red giant, it's likely going to obliterate the inner planets β¦ likely Mercury and Venus will be destroyed,β Blackman said. Earth may survive the event, but will not be habitable. Once the sun completely runs out fuel, it will contract into a cold corpse of a star β a white dwarf.
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Even so, how long would we live if the Sun died?
A relatively simple calculation would show that the Earth's surface temperature would drop by a factor of two about every two months if the Sun were shut off. The current mean temperature of the Earth's surface is about 300 Kelvin (K). This means in two months the temperature would drop to 150K, and 75K in four months.
In addition to that, will our sun ever die? The Sun is about 4.6 billion years old β gauged on the age of other objects in the Solar System that formed around the same time. Based on observations of other stars, astronomers predict it will reach the end of its life in about another 10 billion years.
Into the bargain, what year will Earth be destroyed?
By that point, all life on the Earth will be extinct. The most probable fate of the planet is absorption by the Sun in about 7.5 billion years, after the star has entered the red giant phase and expanded beyond the planet's current orbit.
Can we survive without sun?
All plants would die and, eventually, all animals that rely on plants for food β including humans β would die, too. While some inventive humans might be able to survive on a Sun-less Earth for several days, months, or even years, life without the Sun would eventually prove to be impossible to maintain on Earth.
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