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| Nebula NGC 604 is an enormous cloud of stars, gas, and dust some three million light years away in the nearby spiral galaxy M33 toward the constellation Triangulum. The green glow of the nebula is produced by Oxygen ions powered by ultraviolet light from more than 200 bright, hot stars, which are visible as the pink objects concentrated toward the center of the image. The nebula is nearly 1500 light years across, making it one of the largest gaseous nebulae known. Gaseous nebulae like NGC 604 are usually found in the arms of spiral galaxies, where they provide the raw material from which new stars are formed. |
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