Can you imagine a world without the sun? Know how important sun is to us!

Now, know how important the sun is to us!

Can you imagine a world without the sun? Astronomers' research shows that if there is no sun, the average surface temperature of the Earth will drop below minus 17.78 degrees Celsius within a week, and it will plummet to minus 73.33 degrees Celsius within a year. Most plants will die within a few weeks. Most of the life will disappear because of the disappearance of the sun, and everything will be dead.

Now, know how important the sun is to us! However, the unfortunate thing happened. Recently, foreign scientists' research on solar metal abundance shows that we may overestimate the solar life of 1 billion years, and the sun may die 1 billion years earlier than we expected.

It is understood that the previous life of scientists based on the standard solar model neglecting the rotational effect is about 10 billion years, which is a theoretical value obtained by the stellar evolution program, rather than a real value. Moreover, this value refers only to the central hydrogen combustion life of stellar evolution theory.

"This is not to say that the sun can only exist for 10 billion years. The exact statement should be called the main sequence life of the solar model. In theory, the sun will become a red giant after about 10 billion years, but it still exists, and More sunshine will be emitted," Associate Professor Yang Wuming from the Department of Astronomy of Beijing Normal University told the Science and Technology Daily reporter.

He said that the theoretical value of 10 billion years has many preconditions, and it is necessary to assume the initial elemental abundance of the sun and the physical processes inside the sun. The initial element abundance is different, and the resulting solar model has a different life span. Since it is impossible to truly obtain the initial elemental abundance of the sun and determine the physical processes inside it, the life of the sun and even other stars cannot be accurately estimated.

Twenty years ago, astronomers' direct and indirect measurements of the sun showed that the sun's metal abundance was around 1.8 percent, however, the latest solar spectroscopy measurements show that the sun's metal abundance is only 1.3 percent. It is much lower than the previous measurement results, and correspondingly, the life of the sun will be reduced by 1 billion years.