Many of the Milky Way’s halo stars came from another galaxy that merged with ours 11 billion years ago via WSJ
following an analysis of nearly a quarter of a million stars among the many billions that make up our home galaxy.in the journal Nature, addresses the order in which the Milky Way’s major constituent parts came together to form the colossal spiral-shaped collection of stars that contains our own solar system.
Research conducted in previous decades suggested that halo stars were older than their disk counterparts. But the 2018 release of data collected by the European Space Agency’s Gaia Telescope cast doubt on that understanding. “If you’re going to say, tell me a story of how the galaxy came to be, we really couldn’t do that without a precise clock for individual stars,” said Timothy Beers, a University of Notre Dame astrophysicist who wrote a Nature article accompanying the new study but wasn’t involved in the research.
While that is a tiny fraction of the estimated number of stars in the Milky Way, it is 100 times more stars than have been used previously for star-dating of this type., which maps the movement, position and distance of stars, to determine luminosity, and a ground-based spectroscopy telescope in China to measure the stars’ temperature and elemental makeup.
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