A new article in Popular Science asks, 
“Did Uranus get smacked so hard it spun sideways?”

Charlie Wood’s opening paragraph tells us:

“Like other giant planets, Uranus has a set of rings and more than a dozen moons that make it resemble a miniature solar system unto itself. But unlike its king-sized neighbors (and the rest of the planets for that matter) the ice giant system turns on its side, rolling rather than spinning. Now, a new simulation of the planet’s early years buttresses a theory developed to explain the weird orientation by showing that it can produce the planet’s moons too.”