Haze, a slight clouding of the atmosphere caused by the suspension in the air of dust, soot, or other solid matter. Haze can also occur as a mixture of solid particles with tiny water droplets. A suspension consisting mostly or entirely of water droplets is a mist. A thick mist is a fog. Optical haze is caused by unevenly heated air that refracts light irregularly, causing distant objects to shimmer or waver.
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Condensation, the formation of a liquid from a vapor or gas. It occurs in the formation of clouds and when cooled, water vapor turns into dew or rain.
Every November, the Leonid meteor shower fills the sky with "shooting stars." This year, the shower is expected to peak twice. Learn how Leonid and other meteor showers work.