Futurama Wiki

Thuban 9 is a Planet which is the homeworld to a race of super intelligent cats. This world was ideal for the cats, with sunny days for dozing and the roaming herds of Chicken-Salmon, however the planet stopped spinning (became tidally locked), becoming either too hot or too cold. The cats soon looked for another planet and came upon Earth and planned to steal its rotational energy to beam it to their homeworld.

The plan worked and Earth stopped spinning, but Amy Wong came up with a plan to cause the Earth to rotate in the opposite direction and reclaim the stolen energy. The planet was sapped of Earth's rotational energy and most likely stopped rotating, once again causing extreme climates on the planet.