Space Time
Also known as M57, Messier 57, NGC 6720.
One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.
Ring Nebula is placed at J2000 RA 18.9 h, Dec 33° in Lyra, at an adopted distance of 2,300 light-years.
Ring Nebula (planetary nebula; central source WD 1851+329, central white dwarf): measured diameter 1 light-year; ejection age about 4,000 years; expansion more than 19 km/s (Hubble 1998–2011 comparison); outer radius used for arrival 0.5 light-years.
The bright main disk, central cavity, and polar lobes follow the Hubble and spectroscopic 3D interpretation inside the measured one-light-year extent. Emission points and knot placement are deterministic presentation samples, not individually reconstructed gas parcels.