Uranus axial tilt mystery linked to giant impact hypothesis

Uranus possesses a unique axial tilt of 97.77 degrees, causing it to rotate almost completely on its side. This orientation means its equator is nearly perpendicular to its orbital plane, resulting in a rotation conventionally classified as retrograde.

The leading scientific explanation is the giant impact hypothesis, which suggests a planet-sized body struck the young ice giant off-center, transferring enough angular momentum to tip its axis. While this theory accounts for the tilt, the entire Uranian system presents ongoing challenges to a definitive conclusion. The planet's rings, regular moons, and magnetic field all share a tilted or offset orientation.

Recent observations from the Hubble Space Telescope have provided new data regarding the planet's large moons, such as Titania and Oberon. Findings indicate that the darker surfaces of these outer moons may suggest an accumulation of dust from more distant irregular moons, adding further complexity to the study of the Uranian system.