TONY & DAPHNE HALLAS / SCIENCE PHOTO LIBRARY TONY & DAPHNE HALLAS / SCIENCE PHOTO LIBRARY
Cocoon Nebula (IC 5146), optical image. This nebula is located around 4000 light years from Earth, in the constellation of Cygnus. This is an emission nebula, a large cloud of gas and dust that glows due to the ionisation of its hydrogen gas by ultraviolet radiation from nearby stars.
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