Talos IV (file)
"Talos IV" was a file classified "top secret", and only intended for reading by officers of Starfleet Command. It documented the visit of the  to planet Talos IV in 2254 and the recommendation that an instruction, prohibiting future visits to this world by Starfleet ships, be incorporated into official Starfleet policy. No explanation for this prohibition appeared in the file. ()

The file read:

TOP SECRET
For eyes of STARFLEET Command only
Subject: TALOS IV in third quadrant of vernal galaxy.
Known facts: Detailed information cross referenced with 3XY phagrin level - mass computer.
The only Earthship to visit the planet Talos IV was the  commanded by Captain Christopher Pike with Half-Vulcan Science Officer Spock. 
Recommendations: Be it hereby noted that said following instructions be incorporated in STARFLEET policy: 
NO ONE WILL EVER VISIT TALOS IV.
The following officers have visited Talos IV and recommend that no Human should ever visit it again - - 
Captain Christopher Pike
Half-Vulcan Science Officer Spock

STARFLEET COMMAND
by order of
Robert L. Comsol
Commanding Officer

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