Astronomy Picture of the Day . ... Is this one galaxy or two? ... Above are two computer generated images highlighting how strange things would look. ... The picture is actually composed from two images recorded weeks apart by the Voyager 2 spacecraft during its visit to the Saturnian System in August of 1981. ... But this telescope was designed to detect extreme gamma rays - photons with over 100 billion times the energy of visible light - and actually requires the atmosphere to operate. ...