This is the first time that ‘Dimension’ became ‘Dimensions’. The Doctor and Vicki are surprised to discover a stow-away aboard the TARDIS. It is Steven Taylor who survived the destruction ...

Electrons moved in two dimensions when influenced by a magnetic field, hinting at how a similar effect would occur in the fourth dimension.

Yes, time is linked to space, and time is the fourth dimension. If so, can one travel in time back and forth just as with space? Even before Einstein, the hypothetical concept of travelling into ...