
Ask Ethan: What are the worst cosmic names? | By Ethan Siegel | Start with an explosion! | February 2025
The egg nebula, as it has been photographed here by Hubble, is a preplanetary nebula, since its external layers have not yet heated at sufficient temperatures by the central and contracting star to completely ionize. Many of the giant stars visible today will evolve towards a nebula such as it is before throwing their external…