Diffuse nebulae
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A diffuse nebula is an irregular cloud interstellar matter composed of gas and dust within which stars can be born.
Emission nebula Close to very hot UV emitting stars, gas clouds (hydrogen) are ionized and emit a red light which is characteristic of diffuse emission nebulas.
Reflection nebula Diffuse reflection nebulas, with a dominant blue, do not emit light but reflect the light of other stars.
Other deep sky objects:
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