The Magellanic Stream Made Visible
The Magellanic Stream, which extends almost halfway around the Milky Way, is only detectable at radio wavelengths, and made visible in the wonderful composite image above.
Credit: Science - NASA, ESA, A. Fox, P. Richter et al.
Image - D. Nidever et al., NRAO/AUI/NSF, A. Mellinger, LAB Survey, Parkes, Westerbork, and Arecibo Obs.