Human-defined Scales and Structures
- 18 km — cruising altitude of Concorde
- 27 km — circumference of the Large Hadron Collider, as of May 2010 the largest and highest energy particle accelerator
- 30 km — length of the longest man made dike enclosed by water on two sides, the Afsluitdijk.
- 31.3 km — highest parachute jump (Joseph Kittinger)
- 34.668 km — highest manned balloon flight (Malcolm D. Ross and Victor E. Prather on May 4, 1961)
- 38.422 km — length of the Second Lake Pontchartrain Causeway in Louisiana, US
- 39 km — undersea portion of the Channel tunnel
- 53.9 km — length of the Seikan Tunnel, as of October 2009, the longest rail tunnel in the world.
- 77.1 km — total length of the Panama Canal
Read more about this topic: 1 Myriametre
Famous quotes containing the words scales and/or structures:
“As deaths have accumulated I have begun to think of life and death as a set of balance scales. When one is young, the scale is heavily tipped toward the living. With the first death, the first consciousness of death, the counter scale begins to fall. Death by death, the scales shift weight until what was unthinkable becomes merely a matter of gravity and the fall into death becomes an easy step.”
—Alison Hawthorne Deming (b. 1946)
“The philosopher believes that the value of his philosophy lies in its totality, in its structure: posterity discovers it in the stones with which he built and with which other structures are subsequently built that are frequently better—and so, in the fact that that structure can be demolished and yet still possess value as material.”
—Friedrich Nietzsche (1844–1900)