What Actually Exists Above and Below the Milky Way
Close your eyes and let your mind drift above and below the Milky Way, into the vast, layered cosmos that surrounds our galaxy. A quiet journey into a realm of ancient stars, invisible dark matter, and towering structures of hot gas. Above and below the galaxy's thin disk of stars lies a stellar halo of ancient, metal-poor stars, the galaxy's oldest inhabitants. The most massive component is an enormous dark matter halo, stretching at least 1.9 million light-years across. And above the galactic center, the Fermi Bubbles extend tens of thousands of light-years, a ghostly echo of an ancient…
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