I have recent heard that there are planets that don't orbit around any stars. Would there be wind on these planets? And please explain why or why not.
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Good question, I gave it a star.
No there will be no winds.
Weather on earth is driven by wind, and wind is driven by sunlight or sun heating.
Put simply the sun heats the equator and the warm air rises, cool air from the poles rushes in to fill the gap so there is a constant wind from the poles to the equator at sea level.
The warm air, now at high altitude rushes from the equator to the poles where it descends to fill the gap left by the moving air, so a constant wind at altitude towards the poles.
To complicate the matter is the day - night cycle and coriolis forces caused by the earth's daily spin breaks the wind up from the very simple system I described.
SO with no sun to drive it, no wind.
Even more important any atmosphere will freeze into solid nitrogen snow without a sun to melt it.
No there will be no winds.
Weather on earth is driven by wind, and wind is driven by sunlight or sun heating.
Put simply the sun heats the equator and the warm air rises, cool air from the poles rushes in to fill the gap so there is a constant wind from the poles to the equator at sea level.
The warm air, now at high altitude rushes from the equator to the poles where it descends to fill the gap left by the moving air, so a constant wind at altitude towards the poles.
To complicate the matter is the day - night cycle and coriolis forces caused by the earth's daily spin breaks the wind up from the very simple system I described.
SO with no sun to drive it, no wind.
Even more important any atmosphere will freeze into solid nitrogen snow without a sun to melt it.
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Large planets, Jupiter size or larger, can retain their heat of formation for billions of years. The heat gradient between the core and atmosphere could generate wind. Also note that the planet Neptune has some of the fastest winds in the solar system, far greater than is explained by the minuscule solar energy received from that distance. Scientists don't really understand what drives Neptune's winds. So even in deep space, at least large planets will probably have wind. Whether small, earth-like planets would have wind unknown.
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Wind is the result of an atmosphere. An atmosphere is the result of certain elements in a gaseous state (e.g. oxygen, hydrogen, nitrogen, etc.) gathering around a massive body, drawn there by its gravity. The size of the planet/celestial body would determine the make-up and density of its atmosphere. Any free-floating planet with an atmosphere would have likely had to been a part of a solar system at some point in order to have been near enough to large enough quantities of said gases to accumulate an atmosphere. That said, I'm unfamiliar with the discovery of any such planets.