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| Canon source | Backstage source | Novel source | DITL speculation | 
| # | Series | Season | Source | Comment | 
| 1 | TOS | 3 | For the World is Hollow and I Have Touched the Sky | (321869 m) Stated by Chekov to be 200 miles in diameter | 
| 2 | Speculative | V'Ger (97500 m) Scaled against the USS Enterprise in 'Star Trek : The Motion Picture'. Note that image is somewhat speculative. | ||
| 3 | Speculative | Whale Probe (73500 m) Scaled by comparison with space dock as it passes by. | 
| Series : | TOS Season 3 | 
| Episode : | For the World is Hollow and I Have Touched the Sky | 
| Comment : | (321869 m) Stated by Chekov to be 200 miles in diameter | 
| Source : | Speculative | 
| Comment : | V'Ger (97500 m) Scaled against the USS Enterprise in 'Star Trek : The Motion Picture'. Note that image is somewhat speculative. | 
| Source : | Speculative | 
| Comment : | Whale Probe (73500 m) Scaled by comparison with space dock as it passes by. | 
| © Graham & Ian Kennedy | Page views : 17,699 | Last updated : 28 Oct 2003 |