The BICEP2 team saw a polarization pattern known as "B modes" in the cosmic microwave background (CMB), the ancient light left over from the Big Bang that created the universe 13.8 billion years ago. Wide acceptance of the purported find will likely come only if other instruments pick it up, too — in particular, the European Space Agency's Planck satellie, which mapped out the CMB in fine detail from 2009 to 2013. "Unfortunately, according to our analysis, the effect of contaminants and in particular of gases present in our galaxy cannot be ruled out," co-author Carlo Baccigalupi of the International School for Advanced Studies in Trieste, Italy, said in a statement.
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