Nebula
The Triangulum emission nebula (NGC604) lies in a spiral arm of galaxy M33, 2.7 million light-years from Earth. This nebula is a region in which stars are forming
Originally nebula (Latin for "mist"; plur. nebulae) was a catch-all name for any extended astronomical object, including galaxies beyond the Milky Way. This occasionally survives, but the stricter modern term is used for interstellar clouds of dust and gas, which are categorized by how they are illuminated.
Some types of nebula have special names, such as dark nebulae, emission nebulae, planetary nebulae, reflection nebulae, and solar nebulae.
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The Science Fiction and Fantasy Writers of America annually give out the Nebula Awards.