November 21, 20203 min read, 505 words
Published: November 21, 2020 | 3 min read, 505 words
Some of the Milky Way's oldest stars aren't where we expect them to be.One of the ways we categorize stars is by their metallicity. That is the fraction of heavier elements a star has compared to hydrogen and helium. It's a useful metric because the metallicity of a star is a goo...