Overview

• Webb completed its longest single-filter extragalactic observation by using MIRI to stare at the MIDIS region of the Hubble Ultra Deep Field for nearly 100 hours.
• Combined MIRI plus NIRCam imaging uncovered more than 2,500 galaxies in this tiny sky patch.
• Hundreds of extremely red galaxies in the dataset indicate massive dust-obscured systems or evolved populations with mature stars.
• New analysis revised distances for about 1,000 sources, shifting some galaxy formation back to roughly 450 million years after the Big Bang.
• The dataset’s sharp mid-infrared views will let astronomers dissect galaxy structures, dust composition, star formation and active nuclei over cosmic time.