Poster abstract details

We present Herschel PACS + SPIRE images of the planetary nebula NGC 7293, the Helix Nebula. One of the closest planetary nebulae to Earth. Herschel has permitted this nebula to be studied at unprecedented spatial resolution in the far infrared. By comparing PACS + SPIRE images which trace the location of dust in the nebula with ground-based images tracing molecular H$_2$ emission, we can place constraints on the origin of molecular hydrogen in the nebula. We present photoionisation models which we have used to determine the physical conditions of the dust and investigate formation scenarios for the H$_2$.