Of the tens of thousands of stars near the center of the Milky Way galaxy, there are several hundred objects that do not belong to our galaxy.
In sorting the data obtained from the APOGEE project, performed at the Sloan Digital Sky Observatory (SDSS), the scientists found traces of “fossil galaxies” deep inside the band. Galaxy.
The fossil galaxy may have collided with the Milky Way 10 billion years ago when our galaxy was still in its infancy. Scientists named it Heracles.
“Exotic” stars are located deep inside the Milky Way. Photo: Slashgear.
The Heracles’ remains make up about one-third of the spherical halo of the Milky Way. Studies so far have not found traces of an ancient galaxy inside the one we live in because it is located very deep in the center.
Astronomer Ricardo Schiavon from Liverpool John Moores University “To find fossil galaxies, researchers have to look at the detailed chemical makeup and motions of tens of thousands of stars,” he said.
Observing many of the stars in the center of the Milky Way is difficult because they are obscured by giant interstellar dust clouds. APOGEE is the perfect choice for this type of investigation. It allows astronomers to see through that dust, deep into the galactic center.
To do this, APOGEE uses near infrared light, which is not obscured by dust like visible light.
Finding unusual stars in the heart of the Milky Way is like finding a needle at the bottom of a pool. To separate the Heracles’ stars from the celestial bodies of the Milky Way, the team used both the chemical composition and the velocities of the stars as measured by APOGEE.
Of the tens of thousands of stars surveyed, the researchers say, several hundred have different chemical compositions and velocities. This difference is so great that it can be deduced that they belong to an outer galaxy.
According to the Zing
Will the ‘giant’ meteorite crash into the Earth in 2068?
In the worst case, a meteorite up to 300 m in size will crash into Earth in 2068. But the possibility is not high.