Can we observe several HII regions at once ?
Can we observe several HII regions at once ?. For 6 of our galaxies (M51, M81, NGC6946, NGC2403, NGC4736, and HoII), the is answer is very likely yes. For NGC628, NGC4559, and NGC 6822, the answer is likely no. Galaxy PA Range for Long Low M51 115°-175° M81 114°-173°
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