Wind is the flow o gases on a lairge scale. On the surface o the Yird, wind consists o the bulk movement o air. In ooter space, solar wind is the movement o gases or charged pairticles frae the sun through space, while planetary wind is the ootgassin o licht chemical elements frae a planet's atmosphere intae space. Winds are commonly classified bi thair spatial scale, thair speed, the types o forces that cause them, the regions in which thay occur, an thair effect. The strangest observed winds on a planet in oor solar seestem occur on Neptune an Saturn.