  The first stars ended the cosmic Dark Ages and created the first heavy
elements necessary for the formation of planets and life. The properties of
these stars remain uncertain, and it may be decades before individual Pop III
stars are directly observed. Their masses, however, can be inferred from their
supernova explosions, which may soon be found in both deep-field surveys by
JWST and in all-sky surveys by WFIRST. We have performed radiation
hydrodynamical simulations of the near infrared signals of Pop III
pair-instability supernovae in realistic circumstellar environments with Lyman
absorption by the neutral intergalactic medium. We find that JWST and WFIRST
will detect these explosions out to z ~ 30 and 20, respectively, unveiling the
first generation of stars in the universe.
