idStable URL identifier
Dataset scope
One normalized linear coordinate per landmark.
The dataset does not claim that every object has one universal size. Each row states whether the value is measured, defined, representative, variable, model-dependent or a documented record.
Distances, depths, extents, diameters, heights and theoretical scales remain distinct through measure_kind, measure_label and family.
Field dictionary
What every row contains.
nameHuman-readable landmark name
metresNormalized SI linear value
displayEditorial display value and unit
exponentBase-10 logarithm of metres
realmOne of ten visual scale realms
domainKnowledge sector
measure_kindDiameter, height, depth, distance, extent and related types
measure_labelExact definition of the selected measurement
familyObject, distance, region or limit
certaintyDefined, measured, representative, variable, model-dependent or record
source_urlReference used for the numeric scale
source_checkedDate the reference was last checked
Human-readable preview
Selected rows across the rail.
| Landmark | Value | Measurement | Realm | Certainty |
|---|---|---|---|---|
| Planck length | 1.616 × 10⁻³⁵ m | reference length scale | Quantum | Measured |
| DNA double helix | ≈2 nm wide | double-helix width | Molecular | Measured |
| Human cell | ≈20 µm | representative cell diameter | Cellular | Variable |
| Adult human | ≈1.75 m | representative adult height | Familiar | Variable |
| Blue whale | ≈29 m | representative body length | Monumental | Variable |
| Challenger Deep | ≈10.935 km deep | measured seafloor depth | Planetary | Measured |
| Earth | 12,742 km | mean diameter | Planetary | Measured |
| The Sun | 1.393 million km | mean diameter | Stellar | Measured |
| M87* event horizon | ≈38 billion km | Schwarzschild diameter | Stellar | Model-dependent |
| Observable Universe | ≈93 billion light-years | present-day comoving diameter | Cosmic | Model-dependent |