‘Fossil galaxy’ found deep in the Milky Way
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‘Fossil galaxy’ found deep in the Milky Way

Astronomers suggest they collided when our galaxy was young.

An all-sky image of the stars in the Milky Way as seen from Earth. The coloured rings show the approximate extent of the stars that came from the fossil galaxy known as Heracles. Credit: Danny Horta-Darrington (LJMU), ESA/Gaia, SDSS
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