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  2. Polar night - Wikipedia

    en.wikipedia.org/wiki/Polar_night

    As there are various kinds of twilight, there also exist various kinds of polar twilight that progress towards true polar night. Each kind of polar night is defined as when it is darker than the corresponding kind of twilight. The descriptions below are based on relatively clear skies, so the sky will be darker in the presence of dense clouds.

  3. Noctilucent cloud - Wikipedia

    en.wikipedia.org/wiki/Noctilucent_cloud

    Noctilucent clouds during arctic dawn seen from high altitude. Data from the Aeronomy of Ice in the Mesosphere satellite suggests that noctilucent clouds require water vapour, dust, and very cold temperatures to form. [9] The sources of both the dust and the water vapour in the upper atmosphere are not known with certainty.

  4. Olbers's paradox - Wikipedia

    en.wikipedia.org/wiki/Olbers's_Paradox

    Olbers's paradox says that because the night sky is dark, at least one of these three assumptions must be false. Olbers's paradox , also known as the dark night paradox or Olbers and Cheseaux's paradox , is an argument in astrophysics and physical cosmology that says the darkness of the night sky conflicts with the assumption of an infinite and ...

  5. Arctic Circle - Wikipedia

    en.wikipedia.org/wiki/Arctic_Circle

    Relationship of Earth's axial tilt (ε) to the tropical and polar circles. The Arctic Circle is the southernmost latitude in the Northern Hemisphere at which the centre of the Sun can remain continuously above or below the horizon for twenty-four hours; as a result, at least once each year at any location within the Arctic Circle the centre of the Sun is visible at local midnight, and at least ...

  6. 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 ...

  7. What is lake-effect snow? Winter weather warning as arctic ...

    www.aol.com/lake-effect-snow-winter-weather...

    The moist, warm air rises, and forms clouds that grow into narrow band that can produce 2 to 3 inches, or more, of snow per hour. Wind direction is key in determining the areas that see lake ...

  8. 231 million blasted with arctic air as 'dangerously cold ...

    www.aol.com/dangerously-cold-arctic-outbreak...

    The first arctic outbreak of the season is allowing temperatures to plunge across the eastern half of the country, creating "dangerously cold" wind chills of 15-30 degrees below zero in the ...

  9. Arctic cold snap and lake-effect snow in Midwest, Northeast ...

    www.aol.com/weather/arctic-cold-snap-lake-effect...

    A blast of Arctic air will bring punishing cold winds and bands of heavy lake-effect snow that will bury some towns in fresh feet of snow into Friday, AccuWeather meteorologists warn. However, the ...