Gorgeous
spiral galaxy M33 seems to have more than its fair share of glowing hydrogen
gas. A prominent member of the local group of galaxies, M33 is also known as
the Triangulum Galaxy and lies about 3 million light-years distant. Its inner
30,000 light-years are shown in this telescopic galaxy portrait that enhances
the reddish ionized hydrogen clouds or HII regions. Sprawling along loose
spiral arms that wind toward the core, M33's giant HII regions are some of the
largest known stellar nurseries, sites of the formation of short-lived but very
massive stars. Intense ultraviolet radiation from the luminous, massive stars
ionizes the surrounding hydrogen gas and ultimately produces the characteristic
red glow. To enhance this image, broadband data was used to produce a color
view of the galaxy and combined with narrowband data recorded through a
hydrogen-alpha filter, transmitting the light of the strongest hydrogen
emission line. To see the monochromatic narrowband data alone, move your cursor
over the image, or take this video tour of the hydrogen clouds of M33.
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