This is believed to be due to the presence of a companion to the central white dwarf.

However, the gas walls of the two lobed structures are not at all smooth, but rather are rippled in a complex way.

[3] The central white dwarf, the remaining compact core of the original star, produces a powerful and hot (≈10,000 K) wind blowing with a speed of 300 kilometers per second, which has generated waves 100 billion kilometres high.

The waves are generated by supersonic shocks formed when the local gas is compressed and heated in front of the rapidly expanding lobes.

[6] The star at the center of the Red Spider Nebula is surrounded by a dust shell making its exact properties hard to determine.