HomeAstronomyMysterious 'ancient heart' of the Milky Way discovered

Mysterious ‘ancient heart’ of the Milky Way discovered

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

The collection of 18,000 of our galaxy’s oldest stars are located in the constellation Sagittarius are from the Milky Way’s protogalaxy — a primordial mass of gas and dust forming the first stars of a young galaxy — that is more than 12.5 billion years old. Accounting for an estimated 0.2% of our galaxy’s total mass, the group is the kernel around which all of the Milky Way eventually grew, the researchers found. The findings were published on Sept. 8 on the preprint server arXiv (opens in new tab), and are yet to be peer-reviewed.

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