One-hour cycle
A one-hour cycle is the distance covered by cycling at a constant speed for one hour without stopping.
How big is it?
20 km · distance
Also 12.43 mi
Distance · example
A little perspective
One-hour cycle vs Neutron star: length comparison
The distance of a one-hour cycle is approximately equal to the diameter of a neutron star.
A one-hour cycle is the distance covered by cycling at a constant speed for one hour without stopping.
A neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. A ruler represents the selected distance or a measurement not visible in this view.
Measurements, assumptions & sources +
One-hour cycle
Distance: 20 km; example.
Distance at a constant 20 km/h for one hour. Terrain and rider ability vary.
Defined examples — our methodology
The marked distance is calibrated. Unmeasured illustration details are representative.
Neutron star
Diameter: 20 km; representative.
A 20 km, 1.4 solar-mass teaching model. The precise radius depends on stellar mass and the uncertain behaviour of dense matter.
The marked diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 20 km
We compare the distance of a one-hour cycle. This is an illustrative comparison value, not a claim that every example is the same.
Distance at a constant 20 km/h for one hour. Terrain and rider ability vary.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 20 km | Not recorded | example |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valuePlanets, moons and spaceAdrastea16.4 kmMean-equivalent diameterAdrastea is a small, irregular inner moon of Jupiter, located just outside the planet's main ring.
Around the same scalePlanets, moons and spaceNeutron star20 kmDiameterA neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
Nearest higher valuePlanets, moons and spacePhobos22.53 kmRepresentative mean diameterPhobos is the larger and innermost moon of Mars, notable for its irregular shape and heavily cratered surface.Sources and method
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The source records and measurement method remain available for inspection.
There’s always another scale
Follow your curiosity.
SpaceNeutron star20 kmA neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.SpacePhobos22.53 kmPhobos is the larger and innermost moon of Mars, notable for its irregular shape and heavily cratered surface.PlacesChallenger Deep10.94 kmChallenger Deep is the deepest known point in the Earth's oceans, located in the Mariana Trench.
SpaceDeimos12.4 kmDeimos is the smaller and outermost natural satellite of Mars, with an irregular, rocky shape.
Places100 km² island100 km²An island is a landmass entirely surrounded by water.PeopleOne-hour walk5 kmA one-hour walk is the distance a person travels by walking continuously at a steady pace for one hour.TransportOne-hour drive at 100 km/h100 kmA one-hour drive at a set speed is the distance a vehicle travels in one hour of uninterrupted motion.Built world3 km runway3 kmA runway is a paved strip at an airport where aircraft take off and land.