Astronomers Have Detected One of The Oldest Stars in The Entire Universe

Nov 5, 2018

By Michelle Starr

Whenever we hear of stars discovered that formed just after the Big Bang, they’re very far away, in the far reaches of the visible Universe. But now astronomers have spotted something new: a star that’s around 13.5 billion years old, right here in our own Milky Way galaxy.

It’s called 2MASS J18082002–5104378 B, and it could be one of the oldest stars in the Universe.

The smoking gun is its metal content. In the very early Universe, there were no metals. They were forged in the hearts of the first generations of stars, which spewed them forth into space upon their violent messy deaths.

This material was then mixed up in the formation of new stars, with each subsequent generation growing richer and richer in metals. The younger the star, the greater the metal content, or metallicity. (The Sun is around 100,000 generations from the Big Bang.)

2MASS J18082002–5104378 B has the lowest metallicity of any star ever discovered – only about 10 percent of the metallicity of Earth. Its discovery could mean that the star-dense disc of our galaxy is much older than the 8-10 billion years previously estimated.

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2 comments on “Astronomers Have Detected One of The Oldest Stars in The Entire Universe

  • “The Sun is around 100,000 generations from the Big Bang.”

    Say WTF? That’s impossible. The shortest lived hypergiant stars have a lifespan of about 3 million years. 100,000 generations of even those short lived stars is 300 billion years or over 20 times the age of the universe.

    Yet again I think this is a science article written by a knobhead journalist who doesn’t actually know enough science to understand the work that the article is based on.



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  • “2MASS J18082002–5104378 B has the lowest metallicity of any star ever discovered – only about 10 percent of the metallicity of Earth.”

    More gibberish. I assume this is meant to say “earth’s sun” rather than earth but who knows. The earth has a little hydrogen content as part of its water but other than that has a metallicity of almost 100%. Our sun has a metallicity of about 2% according to the most recent measurements although there is disagreement as some measurements show only about 1.3%.



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