Bipolar nebula

A bipolar nebula is a type of nebula characterized by two lobes either side of a central star.

About 10-20% of planetary nebulae are bipolar.

[2] Though the exact causes of this nebular structure are not known, it is often thought to imply the presence of a binary central star with a period of a few days to a few years.

As one of the two stars expelled its outer layers, the other disrupted the outflow of material to form the bipolar shape.

[3]

Bipolar planetary nebula PN Hb 12 . [ 1 ]
Planetary Nebula M2-9 , otherwise known as the Twin Jet Nebula or the Wings of a Butterfly Nebula, is a bipolar nebula.