  We present STAR's measurement of the $e^{+}e^{-}$ continuum as a function of
centrality, invariant mass, and transverse momentum for U+U collisions at
$\sqrt{s_{NN}}$ = 193 GeV. Also reported are the acceptance-corrected
$e^{+}e^{-}$ invariant mass spectra for minimum-bias Au+Au collisions at
$\sqrt{s_{NN}}$ = 27, 39, and 62.4 GeV and U+U collisions at $\sqrt{s_{NN}}$ =
193 GeV. The connection between the integrated $e^{+}e^{-}$ excess yields
normalized by charge particle multiplicity ($dN_{ch}/dy$) at mid-rapidity and
the lifetime of the fireball is discussed.
