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  2. Cloud iridescence - Wikipedia

    en.wikipedia.org/wiki/Cloud_iridescence

    Iridescent mid altitude clouds Iridescent polar stratospheric cloud at sunset over Aberdeen, Scotland Cloud iridescence, seen above the clouds covered with grey clouds, Pondicherry, India. Cloud iridescence or irisation is a colorful optical phenomenon that occurs in a cloud and appears in the general proximity of the Sun or Moon.

  3. Dark nebula - Wikipedia

    en.wikipedia.org/wiki/Dark_nebula

    Also present are molecular hydrogen, atomic helium, C 18 O (CO with oxygen as the 18 O isotope), CS, NH 3 , H 2 CO (formaldehyde), c-C 3 H 2 (cyclopropenylidene) and a molecular ion N 2 H + (diazenylium), all of which are relatively transparent. These clouds are the spawning grounds of stars and planets, and understanding their development is ...

  4. Translucidus (cloud variety) - Wikipedia

    en.wikipedia.org/wiki/Translucidus_(cloud_variety)

    Sometimes, it lets stars in the night sky be visible. [1] It is the opposite of the cloud variety opacus, which isn't translucent, but opaque. [2] [3] [4] The cloud variety manifests in clouds with thin water particles or ice crystals.

  5. List of cloud types - Wikipedia

    en.wikipedia.org/wiki/List_of_cloud_types

    Thick overcast clouds of sulfur dioxide and carbon dioxide in three main layers at altitudes of 45 to 65 km that obscure the planet's surface and can produce virga. [23] Stratiform Overcast opaque clouds sheets. Stratocumuliform Wave clouds with clear gaps through which lower stratiform layers may be seen. [24] Cumuliform and cumulonimbiform

  6. Rho Ophiuchi cloud complex - Wikipedia

    en.wikipedia.org/wiki/Rho_Ophiuchi_cloud_complex

    The million-year-old star at the center of the disk has a temperature of 3,000 K and is emitting 0.4 times the luminosity of the Sun. [12] The 2023 NASA/ESA/CSA James Webb Space Telescope image—released on the telescope's first anniversary—shows young stars, roughly the size of the Sun, at the center of circumstellar discs. These represent ...

  7. Atmospheric optics - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_optics

    The yellow color is due to the presence of pollutants in the smoke. Yellowish clouds caused by the presence of nitrogen dioxide are sometimes seen in urban areas with high air pollution levels. [22] Red, orange and pink clouds occur almost entirely at sunrise and sunset and are the result of the scattering of sunlight by the atmosphere.

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  9. Night sky - Wikipedia

    en.wikipedia.org/wiki/Night_sky

    Paranal Observatory nights. [3] The concept of noctcaelador tackles the aesthetic perception of the night sky. [4]Depending on local sky cloud cover, pollution, humidity, and light pollution levels, the stars visible to the unaided naked eye appear as hundreds, thousands or tens of thousands of white pinpoints of light in an otherwise near black sky together with some faint nebulae or clouds ...