Jakarta, CNBC Indonesia – The sun, which is 4.6 billion years old, is likely to live up to another 10 billion years. But there will be a process of change from the center of the solar system before it finally dies.
For example, five billion years from now, it is estimated that the Sun will become a red giant. The Sun’s core will shrink and its exterior will expand into Mars, swallowing Earth in the process.
However, Science Alert wrote that at that time human life on Earth had ceased to exist. Because human beings according to the fact will live 1 billion years more with the exception of being able to have a way out due to an increase in the brightness of the Sun every 10% per billion years.
That number is not very large, but it has an impact on the end of Earth’s life. The oceans would evaporate and the surface would become too hot to form water.
Meanwhile, a 2018 model predicts the Sun will shrink into a white dwarf and end up as a Planet Nebula. This fate is the same as 90% of other stars.
“When a star dies, it ejects a mass of gas and dust, known as a shroud, into space. It can be up to half the mass of the star. This reveals the stellar core, at which point the stellar life is running out of fuel, being extinguished and before finally dying. ,” explains astrophysicist from the University of Manchester in England and study author, Albert Zijlstra.
“Only then did the hot core make the ejected envelope glow brightly for 10 thousand years, a brief period in astronomy. This is what makes planetary nebulae visible. Some are so bright that they can be seen from great distances up to tens of millions of light-years away, where the star itself is too dim to see.”
The model created is actually to predict the life cycles of various stars. Namely finding the brightness of the Nebula associated with the mass of different stars.
Nebulae are actually relatively common throughout the observable universe, such as the Helix Nebula, Cat’s Eye Nebula, Ring Nebula, and Bubble Nebula.
All of them were first discovered by William Herschel in the late 18th century. When viewed with a telescope they are all similar to planets.
Meanwhile nearly 30 years ago astronomers noticed the brightest nebula in another galaxy with a similar brightness level. That is, theoretically by looking at it they can calculate how far away it is.
“Old low-mass stars should make nebulae much fainter than younger, more massive stars. This has been a source of conflict for the last 25 years, Zijlstra said.
“The data says you can get a bright nebula on a low-mass star like the Sun, the model says it’s impossible, anything less than about twice the mass of the Sun would make the nebula too dim to see.”
(npb/roy)
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