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• Distances shorter than 100 km
• 100 km is equal to:
  • 62 miles
  • side of square with area 10,000 km²
  • radius of circle with area 31,416 km²
• 100 km -- the altitude at which the FAI defines spaceflight to begin
• 108 km -- length of the Channel Tunnel Rail Link
• 119 km -- diameter of the asteroid 5 AstraeaMain Belt asteroids 5 Astraea ("ass TREE uh") is a large Main belt asteroid. Its surface is highly reflective (bright) and the composition is probably a mixture of nickel- iron with magnesium- and iron- silicates. Astraea was the fifth asteroid discovered
• 130 km -- range of a Scud-A missile
• 136 km -- diameter of the asteroid 8 Flora8 Flora ("FLOR uh") is a large, bright Main belt asteroid. It is probably a mixture of silicate rock and nickel- iron metals. It is the largest member of the Flora asteroid family, a remnant of a larger parent body that shattered in a violent collision.
• 162 km -- diameter of PuckPuck is a moon of Uranus. It was discovered by Voyager 2 in 1986. Little is known about it aside from its orbit, its size, and its dark albedo (approximately 0. Most of the moons of Uranus are named after characters in Shakespeare or Alexander Pope. In Ce, the largest of UranusUranus (pronounced "YOOR--nus", or "yr-AYN-us") is the seventh planet from the Sun. It is a gas giant and the third largest by diameter. It was named after the Greek god Ouranos. Its symbol is either Unicode ♅ (mostly astrological) or (mostly astro' inner moons
• 167 km -- diameter of AmaltheaAmalthea (pronounced "am al THEE a") is the third of Jupiter's known moons. It was discovered on September 9 1892 by Edward Emerson Barnard using the 36 inch (91 cm) refractor telescope at Lick Observatory. Amalthea was the last moon to be discovered by d, one of Jupiter's inner moons
• 170 km -- diameter of HimaliaHimalia (pronounced "hi MAL iya") is a moon of Jupiter. It was discovered by Charles Dillon Perrine at the Lick Observatory in 1904 and is named after the nymph Himalia who bore three sons of Zeus. On December 19, 2000, the Cassini space probe, en route t, one of Jupiter's moons
• 178 km -- diameter of Janus, one of Saturn's moons
• 185 km -- diameter of the asteroid 6 Hebe
• 190 km -- diameter of Sycorax, the largest of Uranus' outer moons
• 200 km -- diameter of the asteroids 7 Iris and 9 Metis
• 203 km -- length of Sognefjorden, Norway, the largest fjord in the world
• 213 km -- length of Paris metro
• 217 km -- length of the Grand Union Canal
• 220 km -- diameter of Phoebe, the largest of Saturn's outer moons
• 223 km -- length of the Madrid Metro
• 234 km -- diameter of the asteroid 3 Juno
• 240 km -- widest width of the English Channel
• 266 km -- mean diameter of Hyperion, one of Saturn's major moons
• 300 km -- range of a Scud-B missile
• 340 km -- diameter of Nereid, the third largest moon of Neptune
• 350 km -- lower bound of Low Earth orbit
• 386 km -- altitude of the International Space Station
• 397 km -- diameter of Mimas, one of Saturn's moons
• 407 km -- diameter of the asteroid 10 Hygiea
• 408 km -- length of the London Underground (active track)
• 420 km -- diameter of Proteus, the second largest moon of Neptune
• 430 km -- length of the Pyrenees
• 468 km -- diameter of the asteroid 4 Vesta
• 470 km -- distance from Dublin to London as the crow flies
• 472 km -- diameter of Miranda, one of Uranus' major moons
• 499 km -- diameter of Enceladus, one of Saturn's moons
• 500 km -- widest width of Sweden from east to west
• 550 km -- distance from San Francisco to Los Angeles as the crow flies
• 526 km -- diameter of the asteroid 2 Pallas
• 590 km -- length of land boundary between Finland and Sweden
• 600 km -- range of a Scud-C missile
• 600 km -- height above ground of the Hubble Space Telescope
• 700 km -- range of a Scud-D missile
• 724 km -- length of the Om River
• 871 km -- distance from Sydney to Melbourne (along the Hume Highway)
• 946 km -- diameter of the asteroid 1 Ceres
• Distances longer than 1,000 km

See also conversion of units.