  Nuclear spins of noble-gas atoms are exceptionally isolated from the
environment and can maintain their quantum properties for hours at room
temperature. Here we develop a mechanism for entangling two such distant
macroscopic ensembles by using coherent light input. The interaction between
the light and the noble-gas spins in each ensemble is mediated by spin-exchange
collisions with alkali-metal spins, which are only virtually excited. The
relevant conditions for experimental realizations with ^{3}\text{He} or
^{129}\text{Xe} are outlined.
