Artist Ashley Zelinskie's new VR work is called "Twin Quasar." Two roads diverge between a pair of quasars, and I'm sorry I can't travel both — actually, wait, I can travel both.

Theories with extra dimensions of space could follow suit, but results 1 from the D0 experiment at Fermilab, Chicago — presented in Physical Review Letters — show that any additional ...

Einstein's special relativity, established in 1905, unified space and time into a four-dimensional continuum. It relies on two core principles: Galileo's relativity and the constancy of light's speed.