is it true that mars change its axis of rotation
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The main change in tilt of an axis of a planet is precession. That does not change the angle between the spin axis and the orbit plane. It just causes the spin axis to be pointed in a different direction. The vector changed but the tilt angle didn't. This precession is due to the moment from the sun's gravity pulling on the bulge of the planet at its equator. The bulge is due to the rotation of the planet. This precession is very slow, taking tens of thousands of years.
Over even longer time scales, other factors can change the angle between the spin axis and the orbit plane. I do not understand those effects as well and I believe that others have already answered, so I'll just leave it at that.
Over even longer time scales, other factors can change the angle between the spin axis and the orbit plane. I do not understand those effects as well and I believe that others have already answered, so I'll just leave it at that.
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Answer:
Mars rotates on its axis, completing one revolution every 24.6 hours. The axis of Mars is tilted at 25 degrees and 12 minutes relative to its orbital plane about the Sun. This produces seasons on the surface of Mars, similar to the seasons on Earth.
https://exoplanets.nasa.gov/
https://science.nasa.gov/
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