Space size comparison library
Planets, moons and spacecraft are brought down to a single visual scale. Planet questions measure diameter, not orbital distance. Equatorial and mean diameters are labelled separately.
22 objects
Callisto
4,821 kmdiameterDiameter in NASA’s Small Worlds comparison table.
spaceCeres
964 kmdiameterEquatorial diameter in NASA’s planet-size guide.
spaceEarth
12,756 kmdiameterRounded equatorial diameter; the polar diameter is slightly smaller.
spaceEris
2,326 kmdiameterRounded diameter published in NASA’s planet-size guide.
spaceEuropa
3,122 kmdiameterDiameter in NASA’s Small Worlds comparison table.
spaceFalcon 9
70 mheightPublished height of the Falcon 9 launch vehicle.
spaceGanymede
5,262 kmdiameterDiameter in NASA’s Small Worlds comparison table.
spaceInternational Space Station
109 mwidthPublished end-to-end overall span of the station.
spaceIo
3,643 kmdiameterDiameter in NASA’s Small Worlds comparison table.
spaceJames Webb primary mirror
6.5 mdiameterDiameter of the primary mirror, not the sunshield or whole telescope.
spaceJupiter
142,984 kmdiameterEquatorial diameter; mean diameter would be smaller.
spaceMars
6,792 kmdiameterEquatorial diameter from NASA’s planet-size guide.
spaceMercury
4,880 kmdiameterRounded equatorial diameter published in NASA’s planet-size guide.
spaceNeptune
49,528 kmdiameterEquatorial diameter from NASA’s planet-size guide.
spacePluto
2,377 kmdiameterRounded diameter published in NASA’s planet-size guide.
spaceSaturn
120,536 kmdiameterEquatorial diameter of the planet’s body; rings are excluded.
spaceSaturn V
110.6 mheightLaunch vehicle height including the Apollo spacecraft.
spaceThe Moon
3,475 kmdiameterRounded diameter in NASA’s Small Worlds fact sheet.
spaceTitan
5,150 kmdiameterDiameter in NASA’s Small Worlds comparison table.
spaceTriton
2,705 kmdiameterDiameter in NASA’s Small Worlds comparison table.
spaceUranus
51,118 kmdiameterEquatorial diameter from NASA’s planet-size guide.
spaceVenus
12,104 kmdiameterEquatorial diameter from NASA’s planet-size guide.
No objects found
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