In March this year, the BICEP2 collaboration announced triumphantly that they had detected "large scale B-mode polarization", which is strong evidence for gravitational waves in the early Universe (see my previous post).
To make this exquisite measurement required the BICEP2 team to make a few assumptions, one of which being that dust in the Milky Way was not creating a false signal. This caused their analysis to come under fire; now, a recent data release from the Planck telescope shows that BICEP2 does indeed has a pretty major dust problem.
Planck and BICEP2 are now combining their data and reanalyzing it -- we'll have to wait until November to hear more. There's also the chance that the Planck telescope data could find the signal without BICEP2's data, stealing the prestigious first detection from underneath the BICEP2 team's noses.
A map of interstellar dust unveiled today has substantially lowered the chances that a South Pole telescope glimpsed the imprint of gravitational waves from the dawn of time, as was claimed in March.