# Is there any thing special with an axial tilt of roughly 25°?

Half of the planets in the solar system have an axial tilt of $$25.5\pm 3^\circ$$: earth (23.5°), mars (25.3°), saturn (26.7°) and neptune (28.3°). If random collisions in the early solar system caused the axial tilt of the planets, it seems like there should be a lot more variation in the planetary tilts. Is there some mechanism that favors tilts around 25°, or is this just a statistical fluke?

Mars (the planet with an axial tilt closest to that of the Earth) has an axial tilt that varies greatly over time. For instance, 4 million years ago, the mean obliquity was $$∼35 ± 10°$$. From the same article: