  Photons and dileptons are emitted throughout the evolution of the deconfined
nuclear medium produced in heavy ion collisions. As such they can provide
valuable information about the different phases of the medium, and complement
hadronic measurements and other observables. In this work, recent developments
related to electromagnetic emissions at early time, in the cross-over region,
and at late times are reviewed. The spacetime description of the nuclear medium
from a hydrodynamic model of heavy ion collisions is used to provide context
and guide the discussion.
