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  2. Water sky - Wikipedia

    en.wikipedia.org/wiki/Water_Sky

    The dark clouds over open water have long been used by polar explorers and scientists to navigate in sea ice. For example, Arctic explorer Fridtjof Nansen and his assistant Hjalmar Johansen used the phenomenon to find lanes of water in their failed expedition to the North Pole , as did Louis Bernacchi and Douglas Mawson in Antarctica.

  3. Barnard 68 - Wikipedia

    en.wikipedia.org/wiki/Barnard_68

    Having a dark cloud in the solar neighborhood greatly facilitates observation and measurement. If not disrupted by external forces, the stability of dust clouds is a fine balance between outward pressure caused by the heat or pressure of the cloud's contents, and inward gravitational forces generated by the same particles (see Jeans instability ...

  4. List of cloud types - Wikipedia

    en.wikipedia.org/wiki/List_of_cloud_types

    Mesospheric noctilucent clouds over Estonia. Noctilucent clouds are thin clouds that come in a variety of forms based from about 80 to 85 kilometres (262,000–279,000 ft) and occasionally seen in deep twilight after sunset and before sunrise. [6] [7] Type 1 Veils, very tenuous stratiform; resembles cirrostratus or poorly defined cirrus. Type 2

  5. Anticrepuscular rays - Wikipedia

    en.wikipedia.org/wiki/Anticrepuscular_rays

    Anticrepuscular rays toward the eastern horizon, as seen from Colorado at dusk These anticrepuscular rays appear to converge at the antisolar point, as seen from an aircraft above the clouded ocean. Panoramic image showing both crepuscular and antisolar rays

  6. Asian brown cloud - Wikipedia

    en.wikipedia.org/wiki/Asian_brown_cloud

    The Indian Ocean brown cloud or Asian brown cloud is a layer of air pollution that recurrently covers parts of South Asia, namely the northern Indian Ocean, India, and Pakistan. [ 1 ] [ 2 ] Viewed from satellite photos , the cloud appears as a giant brown stain hanging in the air over much of the Indian subcontinent and the Indian Ocean every ...

  7. Sea of clouds - Wikipedia

    en.wikipedia.org/wiki/Sea_of_clouds

    A sea of clouds is an overcast layer of stratocumulus clouds, as viewed from above, with a relatively uniform top which shows undulations of very different lengths resembling waves on the sea. [1] A sea of fog is formed from stratus clouds or fog and does not show undulations. [2] In both cases, the phenomenon looks very similar to the open ocean.

  8. Underwater environment - Wikipedia

    en.wikipedia.org/wiki/Underwater_environment

    Clouds over the Atlantic Ocean. An ocean is a body of water that composes much of a planet's hydrosphere. [1] On Earth, an ocean is one of the major conventional divisions of the World Ocean. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans.

  9. Atmospheric optics - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_optics

    As a result, the cloud base can vary from a very light to very dark grey depending on the cloud's thickness and how much light is being reflected or transmitted back to the observer. Thin clouds may look white or appear to have acquired the color of their environment or background. High tropospheric and non-tropospheric clouds appear mostly ...

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