BOTW Directory - Science > Astronomy and Space > Interstellar Medium

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Astrim - Emission Nebulae - Presents photo gallery along with details on types, location, and magnitude of the heavenly body.
Entrance of a Gallery - Emission Nebulae - Presents compilation of images of emission nebulae as well as other space objects such as comets, globular clusters, planets, and galaxies.
National Optical Astronomy Observatory - Emission Nebulae - Showcases photo gallery of glowing clouds of interstellar gas. Comes with specifications and links to related pages.