Like delicate cosmic petals, these clouds of interstellar dust and gas have blossomed light-years away in the fertile star fields of the constellation Cepheus. Sometimes called the Iris Nebula and dutifully cataloged as NGC 7023
Cassiopeia A, an exploded star light-years away. The green ring surrounding the supernova is from the initial shock wave generated by the explosion; it measures 10 light years in diameter. - by the Chandra X-Ray Observatory - Credit: NASA
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The Canada-France-Hawaii Telescope produced this stunning image of the well-known Horsehead Nebula. It is part of an enormous cloud of molecular gas and dust obscuring background light from nearby emission nebula IC producing the silhouette.