100 kilometres

A length of 100 kilometers (about 62 miles), as a rough amount, is relatively common in measurements on Earth and for some astronomical objects. It is the altitude at which the FAI defines spaceflight to begin. To help compare orders of magnitude, this page lists lengths between 100 and 1,000 kilometres (10⁵ and 10⁶ metres).

1 Conversions
2 Human-defined scales and structures
3 Nature
4 Astronomical
5 See also
6 Notes
7 References

Conversions

A distance of 100 kilometres is equal to about 62 miles^[1] (or 62.13711922 miles).

Human-defined scales and structures

108 km — length of High Speed 1 between London and the Channel Tunnel
111 km — distance covered by one degree of latitude on Earth's surface
130 km — range of a Scud-A missile
163 km — length of the Suez Canal
180 km — distance between Mumbai and Nashik
213 km — length of Paris Métro
217 km — length of the Grand Union Canal
220 km — distance between Pune and Nashik
223 km — length of the Madrid Metro
300 km — range of a Scud-B missile
300 km — the approximate distance travelled by light in one millisecond
386 km — altitude of the International Space Station
408 km — length of the London Underground (active track)
470 km — distance from Dublin to London as the crow flies
500 km — widest width of Sweden from east to west
550 km — distance from San Francisco to Los Angeles as the crow flies
560 km — distance of Bordeaux–Paris, formerly the longest one-day professional cycling race
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
804.67 km — (500 miles) distance of the Indy 500 automobile race
871 km — distance from Sydney to Melbourne (along the Hume Highway)

Nature

203 km — length of Sognefjorden, the second largest fjord in the world
240 km — widest width of the English Channel
430 km — length of the Pyrenees
724 km — length of the Om River
897 km — length of the River Douro

Astronomical

100 km — the altitude at which the FAI defines spaceflight to begin
167 km — diameter of Amalthea, one of Jupiter's inner moons
220 km — diameter of Phoebe, the largest of Saturn's outer moons
340 km — diameter of Nereid, the third largest moon of Neptune
350 km — lower bound of Low Earth orbit
420 km — diameter of Proteus, the second largest moon of Neptune
468 km — diameter of the asteroid 4 Vesta
472 km — diameter of Miranda, one of Uranus' major moons
974.6 km — greatest diameter of 1 Ceres,^[2] the largest solar system asteroid^{[note 1]}

Notes

^ The exact category (asteroid/dwarf planet/planet) to which particular solar system objects belong, has been subject to some revision since the discovery of extrasolar planets and trans-Neptunian objects

References

^ Trueknowledge.com, 2010, webpage: "100 km"
^ Thomas, P. C.; Parker, J. Wm.; McFadden, L. A.; et al. (2005). "Differentiation of the asteroid Ceres as revealed by its shape". Nature 437 (7056): 224–226. Bibcode 2005Natur.437..224T. doi:10.1038/nature03938. PMID 16148926.


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