The European Space Agency's Planck spacecraft has provided an incredible new map of our Milky Way galaxy. The image combines multiple views of the Milky Way, and hot gas, dust glows and magnetic fields that mingle in a colorful swirl. It also shows a type of radiation known as ‘free-free’.
This kind of radiation occurs when isolated electrons and protons careen past one another in a series of near-collisions, slowing down but continuing on their own way.
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