BERLIN — The European Space Agency released a trove of data Monday on almost 2 billion stars in the Milky Way, collected by its Gaia space observatory in an effort to create the most accurate and complete map of our galaxy.Astronomers hope to use the data to understand better how stars are born and die, and how the Milky Way evolved over billions of years.The new data includes new information such as the age, mass, temperature and chemical composition of stars. This can be used, for example, to determine which stars were born in another galaxy and then migrated to the Milky Way.
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