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But was it really a swift-crawling baby universe what BICEP2 observed? Or something more mundane as the effect of dust? To collect the light of the CMB (cosmic microwave background, the elusive echo of the Big Bang), BICEP2 had to look through the window glass of our Galaxy with their telescopes. And it turned out that this window is not as clean as previously thought, the dirt being small dust particles. These dust particles modifiy a particular property of light called polarization, which incidentally is the same proxy used to detect the existence of an inflation period. So The specific signature that  the polarization scientists are after is called B-mode polarization, and  could either have been imprinted by inflation right after the Big Bang, which occurred about 13.5 billion years ago, or created by the presence of dust as the ancient light of the CMB finally passed through the Milky Way before reaching the telescopes.