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Utilizing a huge brochure of Sun-like stars developed by ESA’s Gaia objective, astronomers have actually discovered strong proof that our home star took a trip outside with countless excellent equivalents approximately 4 to 6 billion years earlier, using brand-new hints to the development of the Milky Way’s main bar.
An artist’s impression of a migration of the Sun and its excellent twins from the center of the Milky Way around 4 to 6 billion years back. Image credit: NAOJ.
“While archaeology in the world research studies the human past, stellar archaeology traces the large journey of stars and galaxies,” stated Tokyo Metropolitan University astronomer Daisuke Taniguchi and coworkers.
“For example, we understand that our Sun was born around 4.6 billion years back, more than 10,000 light-years more detailed to the center of the Milky Way than we are today.”
“While research studies of the structure of stars support this theory, this has actually long shown a problem to researchers.”
“Observations expose a huge bar-like structure at our Galactic center which produces a corotation barrier, that makes it tough for stars to get away up until now from the center.”
In their research study, the authors intended to develop a big brochure of solar twins, stars whose outstanding specifications are really near those of the Sun.
“Solar twins are specified as stars with outstanding specifications (i.e., efficient temperature level, surface area gravity, and metallicity) really near those of the Sun,” they stated.
“By carrying out differential analyses in between stars with really comparable outstanding criteria– solar twins in our case– one can accomplish an exceptionally high precision in the measurements of outstanding criteria and chemical abundances.”
The astronomers utilized information collected by ESA’s Gaia satellite, an overwhelming chest of observations from 2 billion stars and other things.
They produced a brochure of 6,594 solar twins, a collection around 30 times bigger than previous studies.
From this enormous list, they had the ability to get the most precise photo to date of the ages of these stars, thoroughly fixing for choice predisposition of stars which are much easier to see.
Taking a look at the circulation of ages, they discovered a broad peak for stars around 4 to 6 billion years of ages: this includes our Sun, and is proof for comparable stars of comparable age, placed around the very same range from the center of our Galaxy.
This indicates that our Sun is not at its existing position by mishap, however as part of a much bigger outstanding migration.
The discovery sheds light not just on the nature of our Solar System, however the advancement of the Milky Way itself.
“The corotation barrier produced by the bar structure at the Galactic center would not enable such a mass occasion,” the scientists stated.
“However, the story modifications if it was still being formed at the time.”
“The ages of our solar twins expose not just when the mass escape happened, however the time variety over which the bar was formed.”
“The center of the Galaxy is a far less congenial environment for the advancement of life than external areas.”
“Our findings therefore light up a crucial consider how our Solar System, and in turn our world, discovered itself in an area of the Galaxy where organisms might establish and progress.”
The outcomes were released March 12, 2026 in the journal Astronomy & & Astrophysics
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Daisuke Taniguchi et al2026. Solar twins in Gaia DR3 GSP-Spec. I. Building a big brochure of solar twins with ages. A&A 707, A260; doi: 10.1051/ 0004-6361/2026 58913
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