NGC2237
We are in the constellation of Monoceros, 5,200 light-years from the Solar System. This region hosts an open cluster of blue stars that emit ultraviolet light: this radiation strikes the nebula's gas, colouring it with the characteristic red typical of H II regions. The nebula has a roughly circular, if irregular, shape, with a hole at its centre where the star cluster resides. In the outer areas there are many “Bok globules”, dark clumps marking the spots where star formation is most intense. This beautiful nebula is fully three times larger than the Orion Nebula and, despite its name, is the site of cosmic events of unimaginable power.
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