Chandra Deep Field . ... JHU , AUI , NASA Explanation: Officially the Chandra Deep Field - South , this picture represents the deepest ever x-ray image of the Universe. One million seconds of accumulated exposure time with the orbiting Chandra X-ray Observatory went in to its making. Concentrating on a single, otherwise unremarkable patch of sky in the constellation Fornax , this x-ray image corresponds to the visible light Hubble Deep Field - South released in 1998. ...