Mysterious “ancient core” of the Milky Way discovered using the Gaia probe

Astrophysicists investigating the origins of the Milky Way may have discovered our galaxy’s “old heart” – the original, ancient core around which all of its stars and planets grew.

The collection of 18,000 of the oldest stars in our galaxy are located in the constellation of Sagittarius and come from the protogalaxy of the Milky Way – a primordial mass of gas and dust forming the first stars of a young galaxy – aged from more than 12.5 billion years old. Comprising about 0.2% of the total mass of our galaxy, the cluster is the core around which the entire Milky Way eventually developed, the researchers found. The results were published on September 8 on the preprint server arXivand have not yet been peer reviewed.

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