The TE polarization spectrum measured by the Planck and WMAP satellites indicates potential evidence for superhorizon fluctuations at low multipoles, which may support the theory of pre-big bang inflation. Will Kinney, a physics professor, highlights an anti-correlation in the TE cross-correlation power spectrum that aligns with these superhorizon modes. He presents this data in his book, although it lacks specific literature references. The negative peak near multipole moment ##\ell=100## is particularly significant, as it suggests the presence of superhorizon perturbations, a key prediction of inflationary theory. This finding reinforces the notion that superhorizon perturbations cannot arise from purely causal theories in an expanding universe.