does it have any shape?
No
H II region
H II regions vary greatly in their physical properties. They range in size from so-called "ultra-compact" (UCHII) regions perhaps only a light-year or less across, to giant H II regions several hundred light-years across. Their size is also known as the Stromgren radius and essentially depends on the intensity of the source of ionising photons and the density of the region. Their densities range from over a million particles per cm³ in the ultra-compact H II regions to only a few particles per cm³ in the largest and most extended regions. This implies total masses between perhaps 100 and 10 solar masses.
what is h ii region? A region of interstellar atomic hydrogen that is ionized. where is it located? The Orion Nebula, the Eta Carinae Nebula, and the Berkeley 59 / Cepheus OB4 Complex. how far is it from earth? Sometimes several hundred light-years across. when was it first observed? 1610 and by whom? Nicolas-Claude Fabri de Peiresc who was he? French astronomer, antiquary and savant. did he like collecting things? Yes, he was an avid art collector. what kind of art did he prefer? He became the first admirers and supporters of Caravaggio in France. when did he first start his career as an astronomer? UNANSWERABLE what object did he use to observe the orion? Telescope can you tell me something more about it? An optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects. how many types of it are there? James Clerk Maxwell Telescope, Spitzer Space Telescope, and Hubble Space Telescope. how far can one see using the second one? From about 3 μm (0.003 mm) to 180 μm (0.18 mm). who invented the first telescope? Operated by the Joint Astronomy Centre and was named in honour of mathematical physicist James Clerk Maxwell. what did the scientist observe when they observed the orion? "an unformed fiery mist, the chaotic material of future suns". what is its lifespan? A few million years.
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H II region [SEP] Physical properties
There are also "ultra-dense H II" regions (UDHII). Depending on the size of an H II region there may be several thousand stars within it. This makes H II regions more complicated than planetary nebulae, which have only one central ionising source. Typically H II regions reach temperatures of 10,000 K. They are mostly ionised gases with weak magnetic fields with strengths of several nanoteslas. Nevertheless, H II regions are almost always associated with a cold molecular gas, which originated from the same parent GMC. Magnetic fields are produced by these weak moving electric charges in the ionised gas, suggesting that H II regions might contain electric fields.