The Ringworld measures approximately 1 AU in radius -- roughly 1.5 x 10^8 km from the central star to the habitable inner surface. The ribbon width spans 1.6 million kilometers, providing a habitable surface area equivalent to three million Earth-sized planets. Rim walls rise 1,600 km at each edge to retain the atmospheric envelope against centrifugal acceleration.
Atmospheric retention is achieved through centrifugal pseudo-gravity at 0.992g and rim wall containment. The gas envelope extends 120 km above the inner surface with a pressure gradient matching Earth-standard sea level at the ribbon midpoint. Composition analysis indicates active maintenance by unknown systems -- trace noble gas ratios deviate from natural stellar nucleosynthesis patterns.
The structure orbits its parent G2V-class star at a velocity of 1,200 km/s, generating centrifugal acceleration equivalent to 0.992 standard gravities along the inner surface. Shadow squares in a closer orbit create a 20-hour day/night cycle. Rotational stability is maintained by an unknown mechanism -- no gyroscopic corrections have been detected in 14 billion observation cycles.
> SURVEY STATION 7 // INITIALIZING DATA LINK
> EPOCH 14.221.887 // STANDARD CYCLE 0x4F2A
> STRUCTURAL INTEGRITY: NOMINAL
> ATMOSPHERIC RETENTION: 99.9847%
> SHADOW SQUARE ARRAY: SYNCHRONIZED
> ROTATIONAL VELOCITY: 1,200.0034 km/s
> RIM WALL STATUS: INTACT / NO BREACHES DETECTED
> UNKNOWN MAINTENANCE SYSTEMS: ACTIVE
> OBSERVATION CYCLES COMPLETED: 14,221,887,403
> NOTE: ORIGIN CIVILIZATION SIGNATURES ABSENT
> RECOMMEND: CONTINUED PASSIVE MONITORING
> ringworld.quest // END TRANSMISSION