Read the story here. Advertise at Before It's News here.
Profile image
By Universe Today (Reporter)
Contributor profile | More stories
Story Views
Last hour:
Last 24 hours:

Thanks to Gaia we Know Exactly how and When the Sun Will die

% of readers think this story is Fact. Add your two cents.

Our Sun is doomed. Billions of years from now, the Sun will deplete its hydrogen fuel and swell to a red giant before becoming a white dwarf. It’s a well-known story, and one astronomers have understood for decades. Now, thanks to the latest data from Gaia, we know the Sun’s future in much greater detail.

The timeline of human civilization is a mere blip in the lifetime of a star. We haven’t been around long enough to watch a star’s birth, life, and death. But we can understand stellar evolution by observing other stars that may be older or younger than the Sun. It’s similar to the way you might understand how humans live and die by looking at a collection of photographs all taken at the same time on a single day. One of the first snapshots of stellar evolution was done in the early 1900s. First as a data table by Ejnar Hertzsprung in 1905, but more famously done as a diagram by Henry Norris Russell in 1914. Now known as Hertzsprung-Russell diagrams, or HR diagrams, they plot the color or spectral class of a star versus its absolute magnitude. Color is a measure of a star’s temperature, and absolute magnitude is a gauge of its size.

The first HR diagram vs Gaia’s modern diagram. Credit: Left, Russell. Right, ESA/Gaia

The early HR diagrams only had data for about 300 stars, but even then it was clear most stars lay along a linear path known as the main sequence. Since most stars are within the main sequence, it stands to reason that stars spend most of their lives as main sequence stars. Small stars shine at cool temperatures, while larger more massive stars burn hotter. The HR diagrams showed that some stars such as red giants were large but cool, and others known as white dwarfs were small and hot, but those were the exceptions. As astronomers gathered more data, they could see how larger main sequence stars entered a giant stage before becoming white dwarfs or neutron stars. By and large, the mass of a star determines its lifetime and fate.

We now know that while the mass of a star is an important aspect of stellar evolution, its chemical composition also plays an important role. Two stars similar in mass but different in composition can have very different lifetimes. This is where the Gaia survey comes in. Whereas early stellar surveys had hundreds or thousands of stars, Gaia has more than a billion. In the latest data release, the Gaia team created an HR diagram of more than 4 million stars within 5,000 light-years of Earth. For these stars, we know not only their size and spectral temperature but also know their chemical composition. This means the Gaia team could create an HR diagram of stars with a similar mass and composition to the Sun. The result traces the evolutionary path of Sun-like stars from the main sequence to the red giants. Based on the data, the Sun will reach its maximum temperature at an age of 8 billion years, then shift toward the red giant phase before finally dying at around 11 billion years old.

The path of similar stars shows the Sun’s fate. Credit: ESA/Gaia/DPAC, CC BY-SA 3.0 IGO

The Gaia team also found nearly 6,000 stars that are near twins of the Sun, having similar mass, temperature, composition, and age. By observing these stars, astronomers will get a better understanding of whether our Sun is typical. For example, do these other stars have solar cycles similar to the Sun? Do some have periods of intense solar flares or are they fairly stable like the Sun?

With so much gathered data, Gaia is revealing new details about our own star, how it may behave in the near future, and how it will die in the far future. We’ve long known the end is nigh for the Sun, but we’re beginning to learn just how and when the end will come.

Reference: Creevey, O. L., et al. “Gaia Data Release 3: Astrophysical parameters inference system (Apsis) I–methods and content overview.” arXiv preprint arXiv:2206.05864 (2022).

The post Thanks to Gaia we Know Exactly how and When the Sun Will die appeared first on Universe Today.


Before It’s News® is a community of individuals who report on what’s going on around them, from all around the world.

Anyone can join.
Anyone can contribute.
Anyone can become informed about their world.

"United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.

Please Help Support BeforeitsNews by trying our Natural Health Products below!

Order by Phone at 888-809-8385 or online at M - F 9am to 5pm EST

Order by Phone at 866-388-7003 or online at M - F 9am to 5pm EST

Order by Phone at 866-388-7003 or online at M - F 9am to 5pm EST

Humic & Fulvic Trace Minerals Complex - Nature's most important supplement! Vivid Dreams again!

HNEX HydroNano EXtracellular Water - Improve immune system health and reduce inflammation

Ultimate Clinical Potency Curcumin - Natural pain relief, reduce inflammation and so much more.

MitoCopper - Bioavailable Copper destroys pathogens and gives you more energy. (See Blood Video)
Oxy Powder - Natural Colon Cleanser!  Cleans out toxic buildup with oxygen! 
Nascent Iodine - Promotes detoxification, mental focus and thyroid health.
Smart Meter Cover -  Reduces Smart Meter radiation by 96%!  (See Video)

Report abuse


    Your Comments
    Question   Razz  Sad   Evil  Exclaim  Smile  Redface  Biggrin  Surprised  Eek   Confused   Cool  LOL   Mad   Twisted  Rolleyes   Wink  Idea  Arrow  Neutral  Cry   Mr. Green

    Total 1 comment
    • thatdogwillbite

      Oh well.

    Load more ...




    Email this story
    Email this story

    If you really want to ban this commenter, please write down the reason:

    If you really want to disable all recommended stories, click on OK button. After that, you will be redirect to your options page.