Spiral hierarchy in order of size:
- Virgo supercluster
- Supergiant Achernar (diagram)
- Proto star and planets RXS J1311
- Comet Hale Bop.
Intermediate-sized objects are to be expected: ‘dwarf spherical galaxies’ for instance.
This fractal hierarchy means that other planetary systems are to be expected everywhere in the universe and that extra-terrestrial intelligence is not just a probability but is guaranteed.