The shape of our galaxy may reveal a history of collisions with other galaxies or even galactic clusters.
New measurements suggest that the Milky Way galaxy may have a different shape than we thought.seem to come in three main shapes: Elliptical, irregular and spiral. The majority of known galaxies that fit in this last category seem to have two prominent"arms" that branch out and split into lesser arms. major spiral arms extending out from a thick centralized bulge of stars.
That portrayal could be wrong, however. A team of astronomers has published new research that suggests we have been wrong about the shape of the Milky Way for decades, with our galaxy instead having two main arms just like its contemporary spiral galaxies.
"In spite of much work, the overall spiral structure morphology of the Milky Way remains somewhat uncertain," the astronomers wrote in adescribing their research and conclusions."In the last two decades, accurate distance measurements have provided us with an opportunity to solve this issue." The team assessed data from a new generation of space instruments that can better measure the distance to individual stars which allowed them to measure the distances to around 200 stars and start putting together a map of the Milky Way. They then added data from the European Space Agency 's
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