Illustration of the neutron star RX J0806.4-4123. There is a disc of warm dust that produced an infrared signature in data from the NASA/ESA Hubble Space Telescope (HST). Although not directly imaged by the HST, the data indicate the disc structure is around 29 billion kilometres across. The disc would be made up of material falling back onto the neutron star after the supernova explosion that created the stellar remnant.