Thanks to the latest Gaia satellite catalog from the European Space Agency (ESA), an international team led by astronomers from the Paris Observatory–PSL and the CNRS has achieved the most accurate measurement of the mass of the Milky Way. This study opens important questions in cosmology, particularly on the amount of dark matter contained in our galaxy.
The total mass of the Milky Way is estimated to be only two hundred billion times that of the sun , marking a significant downward revision—approximately four to five times lower than previous estimates.
, which provides comprehensive data for 1.8 billion stars, encompassing all three spatial components and three velocity components in a six-dimensional space within the Milky Way.Using the Gaia data, scientists were able to construct the most accurate rotation curve ever observed for a
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