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May 25, 2021
Infrared image of stars at the center of our Milky Way galaxy, via the Spitzer Space Telescope. Observing in infrared makes it possible to peer behind the gas clouds that otherwise cover the central region of the galaxy. There are around 10 million stars within just 3.3 light-years of the galactic center. These are dominated by red giants, the same kind of old stars found to be from another galaxy in this study. Image via NASA/ JPL-Caltech/ S. Stolovy (SSC/Caltech).
Astronomers used a new technique – asteroseismology combined with spectroscopy – to pinpoint the ages of a sample of around 100 old red giant stars in the Milky Way. They were able to reach a much higher accuracy of the stars’ ages, they said in a statement on May 17, 2021. And they also found that a number of those red giant stars did not originate in the Milky Way! They are instead alien stars, which came here from another galaxy. Their original home in space was Gaia Enceladus (also known as the Ga
A new study led by researchers at Ohio State University provides the latest evidence into the formation of the Milky Way galaxy, including the merger with a key satellite galaxy.
The study, published in the journal Nature Astronomy, was conducted by using relatively new methods in astronomy.
The researchers were able to identify the most precise ages currently possible for a sample of about a hundred red giant stars in the galaxy.