Very deep space objects, so far away that the light from them that is now reaching Earth was emitted soon after the universe has formed.
Its range is in deep infrared, which isn't scattered by cosmic dust as much as visible light. At the same time, very distant objects also have their light very red-shifted before it reaches Earth (relativity and expansion of space effects, to put it simply the photon light waves get stretched) so their light is seen in deep infrared instead of visible.
Side objectives are images of brown dwarfs and rogue planets in interstellar space, and possibly of comets and Kuiper belt objects in our own Solar system (including the anticipated Planet 9, if it exists.)








