A wingspan is not one wing’s length
The 747-8 reference measures the full tip-to-tip wingspan. Dividing that value into another length creates a comparison in full wingspans; it does not give the structural length of a single wing.
The A380 entry uses overall aircraft length. That makes it a valid length comparison, but it should still be labeled as length when shown beside a wingspan.
Keep the component in the description
The Webb reference is its primary-mirror diameter. Curiosity’s reference is vehicle length without the extended arm. Ingenuity’s reference is rotor tip-to-tip span. A caption such as “one spacecraft” would lose the information that makes those measurements usable.
Create a graphic a reader can check
- Select the named references and choose Compare.
- Use metres or feet as shared outputs, then inspect each reference’s source.
- Download a visual PNG, source-rich SVG, or printable comparison.
- Keep the dimension, approximation notes and UniRuler citation with the graphic.