Deep-Sky Object
Protoplanetary Nebula
The brief stage before a planetary nebula forms.
A short-lived (a few thousand years) phase when an evolved star's ejecta is illuminated only in reflected light, before the core ionises the shell.
Overview
A short-lived (a few thousand years) phase when an evolved star's ejecta is illuminated only in reflected light, before the core ionises the shell.
See also
Absorption Nebula
Another name for a dark, light-blocking nebula.
Bipolar Nebula
A nebula with two opposing lobes.
Andromeda Galaxy (M31)
The farthest thing you can see with the naked eye.
Orion Nebula (M42)
A stellar nursery glowing in Orion's sword.
Pleiades (M45)
The Seven Sisters — a young blue cluster.
The Milky Way
Our home galaxy, seen edge-on.