The axis of rotation of some of the planets are tilted - this is what causes seasons on Earth - at some point in its past Uranus was knocked flat on its back.
(Uranus; was knocked; flat) (this; is; what causes seasons on Earth) Context(this is,List([57, 64))):(The axis of rotation of some of the planets; are tilted; )
this is,List([57, 64))
Uranus this The axis of rotation of some of the planets
was knocked is are tilted
flat
what causes seasons on Earth