What is the total lifespan of a sun?

Answer 1

The Sun will continue as a stable star for at least as long as its supply of hydrogen lasts. (Hydrogen nuclei are fused together to form helium in its core, with energy given off).

This is predicted to be for the next 4-5 billion years. By the end of that time, the Sun will begin to fuse helium, and as a result, expand in diameter to perhaps 300 times its present size.

After it burns out its helium, it will begin to reduce in size, then cool. That process will probably take another 5-8 billion years.

It is probably safe to say that the Sun can support life on Earth fairly well for at least another 3 billion years, possibly more.

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Current scientific research suggests that because the Sun is getting hotter, we may not have more than a billion years left as a species

Answer 2

The Death of our Sun * In the next 1.1 billion years, its brightness will increase by 10%. This will super-heat our planet as a result of a severe greenhouse effect. All of the oceans on earth will boil away and all life will be destroyed. * In about 6.5 billion years, our sun will double in brightness and use up all of its supply of hydrogen fuel in its core. This will cause the sun to begin swelling as it uses hydrogen from the layers surrounding the core. * In about 8 billion years the sun will swell to 166 times its present size. This giant star will swallow up Mercury, Venus, and maybe even our Earth. Our sun will then be what scientists call a Red Giant because it will be very large and red in color. * After all hydrogen fuel is used, the sun will begin to use helium as its fuel. This fuel will burn very quickly and only last about 100 million years. * In about 12 billion years, the sun will eject much of its outer layers and become a smoldering, collapsed core that scientists would call a White Dwarf.

Shashank.

Answer 3

Our sun is just your average star. The brighter blue the star, the hotter and faster it burns itself out. The more red the color the cooler and slower it burns through it's fuel. Our suns usable energy life span is 80% over. Check out Astonomy.com for more.

Answer 4

The total lifespan of a sun is approximately 10 billion years. This involves the main sequence phase where hydrogen is fused into helium (about 5 billion years), followed by the expansion into a red giant phase (a few billion years), and ultimately the collapse into a white dwarf (lasting billions of years).

Answer 5

About 10 billion years (and it's about 5 billion years old now).