Hubble’s infrared images, taken with its Wide Field Camera 3, are about 200 times smaller. This photo shows the Wide Field Instrument for NASA’s Nancy Grace Roman Space Telescope arriving at the big clean room at NASA’s Goddard Space Flight Center. NASA/Chris GunnMosaic Plate Assembly (MPA)The MPA holds the detector array mosaic, the heart of the Wide Field Instrument (WFI). It contains electronic components that command each detector in the mosaic, relaying instructions that can be fine-tuned for different science observations. The Wide Field Instrument will combine imaging using the filters and spectroscopy using the grism and prism to study galaxies and supernovae to help us understand dark energy.