Durham University | 2018 Jul 02
Astronomers at Durham University led an international team of experts to investigate how Uranus came to be tilted on its side and what consequences a giant impact would have had on the planet’s evolution.
The team ran the first high-resolution computer simulations of different massive collisions with the ice giant to try to work out how the planet evolved.
The research confirms a previous study that said Uranus’ tilted position was caused by a collision with a massive object – most likely a young proto-planet made of rock and ice - during the formation of the solar system about 4 billion years ago.
The simulations also suggested that debris from the impactor could form a thin shell near the edge of the planet's ice layer and trap the heat emanating from Uranus’ core. The trapping of this internal heat could in part help explain Uranus’ extremely cold temperature of the planet’s outer atmosphere (-216 degrees Celsius, -357 degrees Fahrenheit), the researchers said. ...
Consequences of Giant Impacts on Early Uranus for Rotation, Internal Structure, Debris, and Atmospheric Erosion - J. A. Kegerreis et al