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The 52 pages that link to H II region, each with the reason it gives.

• Massive starRelated: Massive stars power bright H II regions around their birth sites.

• Small Magellanic CloudRelated: These star-forming nebulae illuminate active regions within the galaxy.

• Hydrogen spectrumRelated: Recombining hydrogen produces characteristic emission lines in these nebulae.

• Magellanic CloudsRelated: Bright H II regions trace sites of recent star formation in the Clouds.

• Star formation rateRelated: Its emission traces ionizing radiation from massive stars formed within roughly the past few million years.

• Grand-design spiral galaxyRelated: These luminous regions reveal where spiral arms host recent massive-star formation.

• O-type starRelated: New O-type stars ionize their birth clouds and illuminate these regions.

• Eagle NebulaRelated: Its glowing hydrogen marks gas ionized by the cluster’s ultraviolet light.

• Triangulum GalaxyRelated: M33’s disk contains prominent regions where young stars ionize surrounding gas.

• Flocculent spiral galaxyRelated: Bright H II regions mark the scattered sites of recent star formation in spiral arms.

• Perseus ArmRelated: These luminous regions mark sites of recent massive-star formation along the arm.

• Pillars of CreationRelated: The pillars stand within the Eagle Nebula’s ionized gas, whose radiation drives their erosion.

• Lagoon NebulaRelated: Ionized hydrogen produces much of the Lagoon Nebula’s characteristic red emission.

• R136Related: The cluster’s radiation ionizes gas throughout the surrounding Tarantula Nebula.

• Trapezium ClusterRelated: Radiation from the cluster’s massive stars creates the surrounding ionized gas.

• Trifid NebulaRelated: Ultraviolet radiation from young stars ionizes hydrogen in the Trifid’s glowing gas.

• Zeta OphiuchiRelated: Its ultraviolet photons ionize gas around the star and illuminate its environment.