March 17, 2021

Abell 78 (Image ESA/Hubble & NASA, M. Guerrero. Acknowledgement: Judy Schmidt)

A composite image that combines data obtained from the Hubble Space Telescope and the Pan-STARRS1 telescope in Hawaii shows the details of the planetary nebula Abell 78. It’s rather unusual among planetary nebulae because it’s a so-called born again star whose core stopped nuclear fusion but the density reached by the external layers ejected in a violent way triggered the fusion of helium in them. The consequence is an even more violent ejection of materials that generated the nebula’s irregular shape around the now dying progenitor star.