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Pieter Kluyver (1816–1900)
A weather vane is used to find out where the wind comes from.
Wind socks such as this one are often used on airports. They show the direction of the wind. They can also show how strong the wind is.

Wind is the flow of gases. On Earth, wind is mostly the movement of air. In outer space, solar wind is the movement of gases or particles from the sun through space. The strongest winds seen on a planet in our solar system are on Neptune and Saturn.

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