This is the first such map based on directly measured distances to thousands of celestial landmarks across the galaxy. These findings helped the astronomers build a large-scale 3D map of the Milky Way. "This took six years but it was worth it," study lead author Dorota Skowron, an astrophysicist at the University of Warsaw in Poland, told. Using the Optical Gravitational Lensing Experiment, which monitors the brightness of nearly 2 billion stars, the scientists charted the distance between the sun and more than 2,400 Cepheids throughout the Milky Way. Skowron/OGLE/Astronomical Observatory, University of Warsaw)
Red points indicate older stars, while younger ones are shown in blue. This image compares a simulation of the Milky Way galaxy's Cepheid star variables (left) with actual observations of their numbers (right).
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