The Milky Way has an Inner Ring, Just Outside the Core - Universe Today universetoday storybywill
– with advanced computer simulations. The result was a state-of-the-art model of the inner Milky Way that revealed a slow bar with a peanut-shaped bulge. This bulge is populated by stars that formed four to nine billion years ago, with a peak in age between six and eight billion years.
This allowed the MPE team to determine the element abundances, positions, line-of-sight velocities, and approximate ages of all the stars in the newly-observed bulge. Meanwhile, the data obtained by the ESA’smission provided accurate measurements of the positions and proper motions of these stars. The team then combined all of these observations with a model they created of the workings of the inner Milky Way. As Shola M. Wylie, a Ph.D.
Annotated diagram of the Milky Way. The sun is indicated near the bottom in the Orion Spur. Credit: NASA
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