M33
In the constellation of Triangulum. About 3 million light-years away lies M33 (also known as NGC 598), a spiral galaxy named after the constellation it belongs to. The Triangulum Galaxy is the second-closest galaxy to us after the Andromeda Galaxy. Herschel catalogued an H II region within it (NGC 604), one of the largest known regions of ionized hydrogen: it measures nearly 1,500 light-years across, about 40 times larger than the visible part of the Orion Nebula.
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