Dazzle or dust?

Unpredictable glow of galactic dust could undermine biggest cosmological discovery in years

DUSTY DATA  The BICEP team used one map (left) to estimate the effect of galactic dust on the polarization of light across the sky (red denotes stronger polarization, blue weaker). Raphael Flauger reconstructed a similar map (right) from other sources showing that dust could account for much more of the signal detected by the BICEP team.

J.-P. Bernard/Planck Collaboration; R. Flauger

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