Around 1 billion years ago, our planet likely took only 19 hours to complete a single rotation, before slowing to the 24 hours we experience today. It also changes on shorter timescales.

Szapudi and their colleagues’ new model indicates the universe finishes a single rotation once every 500 billion years—meaning there’s still quite a bit of time before the universe ...

Around 1 billion years ago, our planet likely took only 19 hours to complete a single rotation, before slowing to the 24 hours we experience today. It also changes on shorter timescales.

During the remainder of a single rotation of the input drive, the output drive is stationary. Therefore, over one full rotation of the input drive, the output drive experiences intermittent ...