Oldest star found 90 light years away from Earth
Astronomers from the University of Warwick have discovered the oldest star in the Milky Way. It is the debris accumulated from the old rocky and icy planetary system from the orbiting planets. According to ANI, researchers have come to the conclusion that a weak white dwarf that is 90 light-years away from Earth is the remnant of an orbiting planetary system, which is more than 10 billion years old. Researchers have given this information after publishing their research in the monthly Royal Astronomical Society.
What is a white dwarf?
It is certain that after hundreds of millions of years, most stars including the Sun will eventually turn into white dwarfs. Any star that has used up all of its fuel, has lost its outer layers and is currently shrinking and cooling, will eventually become a white dwarf. If any planet is destroyed during this process, then its debris starts accumulating on this white dwarf.
The oldest star has a characteristic ‘reddish’
To work on this research, a team led by scientists from the University of Warwick selected two unique white dwarfs observed by the European Space Agency’s GAIA Space Observatory as models and based on that research. Planetary remnants are present on both stars, one of them strikingly blue and the other distinctively red. Light of different wavelengths of stars can be detected with the help of spectroscopy to find out what substances are present there.
WDJ2147-4035 is the oldest star
On this basis, scientists have identified WDJ2147-4035 as the oldest metal-polluted white dwarf ever discovered. For this, they have detected the carbon assembled on the sodium, lithium and potassium potentially found on that star. The second blue or blue star WDJ1922+0233 is slightly newer than the first. The planetary remains on it are similar to the material present on the Earth’s crust. Scientists have come to the conclusion that WDJ1922+0233 has a strange helium-hydrogen mixture, due to which it is unusually blue in color despite the cold surface temperature.
What does the ‘rare’ red color indicate?
Whereas, the remnant on the star WDJ2147-4035 (red) is almost pure-helium and has a very high gravity, that of an ancient planetary system, which has transformed into a dwarf star. On this basis, scientists have considered it a white dwarf of the oldest planetary system, which has been found in the galaxy till date. Lead author of this research and PhD student Abigail Elms in the Department of Physics at the University of Warwick said, ‘The corrupted remains of the star show that the Earth is not unique, there are many other planetary systems, which have the remains of a planet similar to the Earth.’
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‘97% of stars will eventually become white dwarfs’
He said that ‘… 97% of stars will eventually become white dwarfs and they are so massive around the universe that it is very important to understand them, especially such very cool ones. Cool white dwarfs formed from the oldest stars in our galaxy give information about the evolution and formation of the Milky Way’s planetary system.’ According to him, ‘We are looking for remnants associated with the oldest stars in the Milky Way, which have once been polluted by the remnants of planets where Earth’s. It is shocking to think that all this happened 10 billion years ago. Such planets have died when the earth was not even formed. (Photos – Indicative)