Alien astronomers living in another galaxy might see our Milky Way's 100 billion stars as little more than a tiny blur of light in their night sky.
Yet if they analyzed the frequencies of light in that faint smudge, they might be able to decipher what our galaxy is made of.
This raises the question: What does the Milky Way's chemistry look like from millions of light years away? Research led by the Max Planck Institute for Astronomy in Germany and Yunnan University in China has provided an answer: Our galaxy is an oddball, though not one-of-a-kind. The Milky Way sticks out among other similarly sized galaxies with metal concentrations that are very low at the center, rise towards the halfway point, and then peter out on the outskirts of the galaxy.
By comparison, the metal distribution of other galaxies is much flatter, more like a pancake than a doughnut.."The Milky Way might not have a typical metallicity distribution for a galaxy of its mass."Hydrogen and helium nuclei formed around
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