قالب وردپرس درنا توس
Home / Science / Even after death, the future of our sun looks bright

Even after death, the future of our sun looks bright



  Even after death, the future of our sun looks bright

The planetary nebula Abell 39 has a diameter of about 5 light years and is about 7000 light-years from Earth.

Credit: T.A. Rector (NRAO / AUI / NSF and NOAO / AURA / NSF) and B.A. Wolpa (NOAO / AURA / NSF)

All stars are dying, and at some point ̵

1; in about 5 billion years – our sun will also be. Once his hydrogen supply is exhausted, the last dramatic stages of his life will unfold as our star becomes a red giant and then rips its body to pieces to condense into a white dwarf.

But after his life is over, what will it look like? Astronomers have a new answer, and their conclusions shine. [Rainbow Album: The Many Colors of the Sun]

The length of the life of a star depends on its size. Our Sun is a yellow dwarf with a diameter of about 864,000 miles (1,390,473 kilometers) or about 109 times the size of the Earth, according to NASA. Yellow dwarf stars live for about 10 billion years, and at 4.5 billion years, our middle-aged sun is about halfway through its lifetime.

Once the hydrogen supply is exhausted, the sun will begin to consume its heavier elements. During this volatile and turbulent phase, massive amounts of star material will be thrown into space as the body of the Sun expands to 100 times its current size and becomes a red giant. Then it will shrink to a tiny, extremely dense white dwarf star, about the size of Earth.

Enlightened by the cooling white dwarf, the cloud of gas and dust that the sun spit into space becomes a swirling red giant. Whether this cloud was visible or not has long been a mystery. An estimated 90 percent of dying stars emit a ghostly halo of dust that lasts for thousands of years. However, computer models introduced decades ago indicated that a star would need to be about twice as large as our sun to create a cloud bright enough to be seen, the study authors say.

However, this prediction did not agree with the sparkle over galaxies. Visible nebulae flashed in young spiral galaxies that were known to host massive stars that could produce glowing dust clouds at the end of their lives.

But even in ancient elliptical galaxies that are populated with stars of low stars, fog shines mass – according to the computer models, these stars could not have produced any visible clouds at all. This puzzling, apparent contradiction is "a long-standing mystery" about the final stages of low-mass stars, the international research team wrote in the study.


Source link