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The fine tuning of parameters required to reproduce our present day Universesuggests that our Universe may simply be a region within an eternally inflatingsuper-region. Many other regions beyond our observable Universe would existwith each such region governed by a different set of physical parameters.Collision between these regions, if they occur, should leave signatures ofanisotropy in the cosmic microwave background (CMB) but have not been seen. Weanalyze the spectral properties of masked, foreground-cleaned maps between 100and 545 GHz constructed from the Planck dataset. Four distinct $\sim2-4\arcdeg$regions associated with CMB cold spots show anomalously strong 143 GHz emissionbut no correspondingly strong emission at either 100 or 217 GHz. The signal tonoise of this 143 GHz residual emission is at the $\gtrsim$6$\sigma$ levelwhich reduces to $3.2-5.4\sigma$ after subtraction of remainingsynchrotron/free-free foregrounds. We assess different mechanisms for thisresidual emission and conclude that although there is a 30\% probability thatnoise fluctuations may cause foregrounds to fall within 3$\sigma$ of theexcess, there is less than a 0.5\% probability that foregrounds can explain allthe excess. A plausible explanation is that the collision of our Universe withan alternate Universe whose baryon to photon ratio is a factor of $\sim$4500larger than ours, could produce enhanced Hydrogen Paschen-series emission atthe epoch of recombination. Future spectral mapping and deeper observations at100 and 217 GHz are needed to mitigate systematics arising from unknownGalactic foregrounds and to confirm this unusual hypothesis.

Spectral Variations of the Sky: Constraints on Alternate Universes