"Invisible Galaxy Centaurus A" --Would Appear 20 Times Size of Full Moon If Human Eyes Could See It.

If our eyes could see radio waves, the nearby galaxy Centaurus A would be one of the biggest and brightest objects in the sky, nearly 20 times the apparent size of a full moon. But our eyes can only see wavelengths between 0.00004 and 0.00008 of a centimeter (where, not surprisingly, the Sun and stars emit most of their energy).

What we can't see when looking at the galaxy in visible light is that it lies nestled between a pair of giant radio-emitting gas plumes ejected by its supersized black hole. Each plume is nearly a million light-years long.

NASA's Fermi Gamma-Ray Space Telescope maps gamma rays, radiation that typically packs 100 billion times the energy of radio waves. Nevertheless, and to the surprise of many astrophysicists, the plumes show up clearly in the satellite's first 10 months of data.
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