Lights off: BICEP2's dusty window into the past Astronomers working on the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) tele You’ve reached the limit of what you can view on Physics World without registering If you already have an account on Physics World, then please sign in to continue reading If you do not yet have an account, please register so you can Unlock all the content on the site Choose which e-mail newsletters you would like to receive Want to read more? Register to unlock all the content on the site E-mail Address