I understood what Ann said about Mars' similar tilt and how that causes seasons, is it impossible then for untilted planets to even have seasons? I don't know that any planet has no tilt at all. In any case, what else is known about seasons on the other planets of the Solar System?
The Uranian system has a unique configuration among the planets because its axis of rotation is tilted sideways, nearly into the plane of its revolution about the Sun. Its north and south poles therefore lie where most other planets have their equators.
Terrestrial observers have seen signs of seasonal change and increased weather activity in recent years as Uranus approached its equinox.
Ann wrote:Again, I'm not the expert here. As far as I can understand, however, if a planet's axis of rotation is at right angles to its orbital plane, the planet should not experience seasons.
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