A view across the top of the NOvA far detector in Ash River, Minnesota. Electronics that make up part of the data acquisition system are installed along the top and sides of the detector. The far detector measures roughly 200 feet long, 50 feet high and 50 feet wide, and is made of PVC filled with a scintillating oil. Neutrino interactions inside the detector create light, which travels up fiber optic cables to the banks of computers. Photo: Fermilab.