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The sun will explode into a planetary nebula



  The sun will explode into a planetary nebula

One day our sun will die and when it does, it will explode into a spectacular planetary nebula that will mark the end of life on Earth.

It will be a very long time before our sun dies, but if it does, its end will be quite spectacular. Scientists at the University of Manchester say in a new paper that in about 10 billion years, the sun will explode into a planetary nebula, which would mean the end of any life here on Earth, assuming there are any.

Scientists have always known that the sun would die during this period, but what was unclear was exactly what the death of the sun might look like. But a team of international astronomers predicts it will explode into a huge ring of interstellar gas and dust called the "infinite nebula," leaving 90 percent of the stars dead.

The Reason Scientists Can not Accept the Sun Like most stars, many thought they had too small a mass to create a planetary nebula. Therefore, the researchers used a new data model that predicts the life cycle of stars, and it was found that the Sun is likely to end up this way. At that point, the sun will change from a red giant to a white dwarf.

The full statement of the University follows below.

Scientists agree that the sun will die in about 1

0 billion years, but they were not sure What would happen next … until now.

A team of international astronomers, including Professor Albert Zijlstra of the University of Manchester, predicts that it will turn into a massive ring of luminous, interstellar gas and dust, known as planetary nebulae. 19659004] A planetary nebula marks the end of 90% of all active stars and marks the transition of the star from a red giant to a degenerate white dwarf. But for years, scientists were not sure if the sun in our galaxy would follow the same fate: it was assumed that it had too little mass to produce a visible planetary nebula.

To find out that the team developed a new star, a data model that predicts the life cycle of stars. The model was used to predict the brightness (or brightness) of the ejected envelope for stars of different masses and ages.

The research will be published in Natural Astronomy on Monday, May 7th.

Prof Zijslra explains, "When a star dies, it ejects a mass of gas and dust – known as its shell – into space, which can be as much as half the mass of the star, revealing the core of the star, which at that time in the life of the star has no more fuel, finally leaves and finally dies.

"Only then does the hot core light the ejected shell for about 10,000 years – a short time in astronomy. This makes the planetary nebula visible. Some are so bright that you can see them from extremely long distances of tens of millions of light-years, where the star itself would be too weak to see.

The model also solves another problem that baffles astronomers A quarter century

About 25 years ago, astronomers discovered that when you look at planetary nebulae in another galaxy, the brightest ones always have the same brightness it was found that it was possible to see how far away a galaxy was from the appearance of its brightest planetary nebulae, in theory it worked in some galaxy of the type.

But while the data suggested that this was correct, The scientific models claimed differently: Prof. Zijlstra adds: "Old, low-mass stars should produce much weaker planetary nebulae than young, massive stars. This has been a source of conflict for the past 25 years.

"The data suggest that one can get bright planetary nebulae from stars of low mass like the Sun, the models said that that was not possible, just less than about twice the mass of the Sun would give a planetary nebula too weak to see it. "

The new models show that the stars heat up three times faster after ejection of the shell than in older models. This makes it easier for a star of low mass, like the sun, to form a bright planetary nebula. The team found that in the new models, the Sun is almost exactly the lowest mass star that still produces a visible, albeit weak, planetary nebula. Stars that are even a few percent smaller do not do that.

Professor Zijlstra added: "We found that stars with a mass less than 1.1 times the mass of the sun produce weaker nebulae and stars more than 3 solar masses brighter nebulae, but for the rest, the predicted brightness is very high close to what was observed Problem solved after 25 years!

"That's a nice result. We now have not only one way to measure the presence of stars at the age of billions of years in distant galaxies, which is an area that is remarkably difficult to measure. We even found out what the sun will do when it dies! "


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