Wild Milky Way Map Reveals Hidden Loops of Multicolored Microwaves
Currents of bold color swirling in the image above look like an impressionist's painting, but are actually a map of microwaves emanating from the Milky Way galaxy.

This vivid snapshot captures light radiating outward as charged particles zip through in the galaxy's magnetic fields. The low-energy light waves also reveal the presence of a ring of dust that cordons off a third of the sky.

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The associated paper is titled "Planck 2015 results. XXV. Diffuse low-frequency Galactic foregrounds", and is still not published in A&A (per ADS), despite having been submitted almost ten months' ago now. Link to the arXiv abstract.