Is Dust the Best Thing in the Universe? Part 2: The Astronomer's Headache

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The Milky Way arching over an ESO telescope. The dark lanes running down the galactic plane are dust. A lot of dust. (CC BY 4.0, ESO/Y. Beletsky)

Dust scatters light, absorbs light, re-emits light, and ruins everything. It's why our maps of the Milky Way were wrong before 1930, and it's why one of the biggest cosmological announcements of the 2010s quietly evaporated.

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Is Dust the Best Thing in the Universe? Part 2: The Astronomer's Headache

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