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Surprise – The Milky Way Galaxy is Not as Homogeneous as Previously Thought

Posted by Guy Pirro 09/17/2021 05:24PM

Surprise – The Milky Way Galaxy is Not as Homogeneous as Previously Thought

In order to better understand the history and evolution of the Milky Way, astronomers are studying the composition of the gases and metals that make up an important part of our galaxy. This includes 1) the initial gas coming from outside our galaxy, 2) the gas between the stars inside our galaxy, often enriched with chemical elements, and 3) the dust created by the condensation of the metals present in this gas. Until now, theoretical models assumed that these three elements were homogeneously mixed throughout the Milky Way and reached a level of chemical enrichment similar to the Sun’s atmosphere, called the Solar Metallicity. A team of astronomers from the University of Geneva in Switzerland have observed the composition of these gases in our galaxy and have shown that, contrary to the models established until now, they are not as homogeneously mixed as previously thought. This has an impact on the current understanding of the evolution of galaxies and, as a result, our understanding of the Milky Way’s evolution will need to be revisited.


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