HUBBLE ATLAS
NGC 604 in Galaxy M 33 (M 33 , Messier 33 , NGC 604 , Triangulum Pinwheel) — image from the Hubble Space Telescope

Nebulae

NGC 604 in Galaxy M 33

August 7, 1996 · ESA/Hubble · M 33 , Messier 33 , NGC 604 , Triangulum Pinwheel

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At the heart of NGC 604 are over 200 hot stars, much more massive than our Sun (15 to 60 solar masses).

They heat the gaseous walls of the nebula making the gas fluoresce. Their light also highlights the nebula's three-dimensional shape, like a lantern in a cavern.