The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 61 Cygni A (11 members)
- 61 Cygni B (8 members)
- 61 Cygni B VII (1 member)
- Acerbus Cluster (2 members)
- Achievement icons (76 members)
- Achievements (77 members)
- Acid-type planets (1 member)
- Acroix Cluster (2 members)
- Alien images (4 members)
- Aliens (23 members)
- Alkali-class planets (1 member)
- Alkali-type planets (1 member)
- Alpha Brutus (1 member)
- Alpha Centauri (1 member)
- Alpha Centauri A (9 members)
- Alpha Centauri B (18 members)
- Alpha Gladius A (2 members)
- Alpha Gladius B (2 members)
- Alpha Lynx (3 members)
- Alpha Mus (7 members)
- Alpha Repeculae (15 members)
- Alpha Satori A (3 members)
- Alpha Strife (1 member)
- Alpha Wendigo (3 members)
- Alpha Ymir (8 members)
- Altair (14 members)
- Apocolyptum Cluster (1 member)
- Arachnus Cluster (1 member)
- Arcturus (1 member)
- Aspis Cluster (1 member)
- Auric-type planets (1 member)
- Barnard's Star (10 members)
- Base Metal resources (38 members)
- Bernard's Star (1 member)
- Beta Acroix (5 members)
- Beta Brutus (1 member)
- Beta Chaudhary (2 members)
- Beta Llvoren (3 members)
- Beta Lynx (4 members)
- Beta Pavo (14 members)
- Beta Strife (1 member)
- Boklos Cluster (1 member)
- Brown Dwarf-class planets (2 members)
- Brown dwarf-type planets (1 member)
- Brutus Cluster (5 members)
- Candidates for deletion (2 members)
- Candidates for speedy deletion (0 members)
- Canyon-class planets (13 members)
- Canyon-type planets (4 members)
- Capella A (1 member)