Sunday, 27 March 2022 – 18:27 WIB
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VIVA – For an astronomer China and Europe managed to accurately map the formation and evolution Galaxy Bima Sakti in the early and middle stages using sky survey data.
The survey data was obtained from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) in China and the Gaia Satellite belonging to the European Space Agency (ESA).
The study, published in the journal Nature as the main topic, reports an analysis of about 250,000 subgiant stars with very accurate ages, indicating that the formation of the thick and aged galactic disk began about 13 billion years ago, just 800 million years after the Big Bang. .
Xiang Maosheng and Hans-Walter Rix of the Max-Planck Institute for Astronomy analyzed the spectra of the millions of stars observed by LAMOST and the locations and movements of the 1.4 billion stars provided by Gaia.
The findings show that the growth of the Milky Way galaxy can be divided into two parts, namely the early stage from 13 billion years to 8 billion years ago when the stellar halo and thick disk formed, and the final stage when the thin disk formed.
Most of the stars in the thick disk formed about 11 billion years ago, when Gaia Sausage, the remnant of a dwarf galaxy, merged with the Milky Way Galaxy, adding at least eight globular clusters or globular clusters along with stars, gas, and dark material with a size of 50 billion. mass of the sun.
Over the next five to six billion years, the Milky Way experienced a continuous enrichment of chemical elements, eventually up to 10 times, while the star-forming gases managed to remain well mixed, according to the study.
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