Celestial hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  HD9483  ·  IC 131  ·  IC 132  ·  IC 133  ·  IC 135  ·  IC 136  ·  IC 137  ·  IC 142  ·  IC 143  ·  M 33  ·  NGC 588  ·  NGC 592  ·  NGC 595  ·  NGC 598  ·  NGC 604  ·  Triangulum Galaxy  ·  Triangulum Pinwheel
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M33 Triangulum Galaxy, Harold Soto
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M33 Triangulum Galaxy

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M33 Triangulum Galaxy, Harold Soto
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M33 Triangulum Galaxy

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Description

Under dark sky conditions, M33 is just barely visible with the naked eye in the constellation Triangulum, just west of Andromeda and Pisces. Among the galaxy’s most distinctive features are ionized hydrogen clouds, also called H-II regions, which are massive regions of starbirth. Among Triangulum's most distinctive features is NGC 604, a region of starbirth so big that the Space Telescope Science Institute once described it as "monstrous." Their 2003 estimate says that the gas cloud has more than 200 blue stars and that it is more than 1,300 light years across — or about 100 times bigger than the Orion Nebula.

"If NGC 604 were at the same distance from Earth as the Orion Nebula, it would be the brightest object in the night sky (besides the moon).

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M33 Triangulum Galaxy, Harold Soto