Astronomical
- 10 km — diameter of the most massive neutron stars (3 – 5 solar masses)
- 13 km — mean diameter of Deimos, the smaller moon of Mars
- 20 km — diameter of the least massive neutron stars (1.44 solar masses)
- 20 km — diameter of Leda, one of Jupiter's moons
- 20 km — diameter of Pan, one of Saturn's moons
- 22 km — diameter of Phobos, the larger moon of Mars
- 27 km — height of Olympus Mons above the Mars reference level, the highest known mountain of the Solar System
- 43 km — diameter difference of Earth's equatorial bulge
- 66 km — diameter of Naiad, the innermost of Neptune's moons
Distances longer than 100 kilometres
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