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The kilometre (SI symbol: km; / ˈ k ɪ l ə m iː t ər / or / k ɪ ˈ l ɒ m ə t ər /), spelt kilometer in American and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo-being the SI prefix for 1000).
Total areas including water are also given, but when ranked by total area, a number of coastal cities appear disproportionately larger. San Francisco is an extreme example: water makes up nearly 80% of its total area of 232 square miles (601 km 2).
Earth radius R 🜨 ≈ 6,371 km [9] Lunar distance LD ≈ 384 402 km. [10] Average distance between the center of Earth and the center of the Moon. astronomical unit au. Defined as 149 597 870 700 m. [11] Approximately the distance between the Earth and Sun. light-year ly ≈ 9 460 730 472 580.8 km.
Sprawling across 400 square kilometers (154 square miles), ... Larger than Delaware and roughly the same size as Wales, Yellowstone was considered huge when it became the world’s first national ...
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, [158] [159] the highest-known mountain of the ...
This list includes all islands in the world larger than 1,000 km 2 (390 sq mi). ... It is 61 km (38 mi) long and between 13 and 34 km (8.1 and 21.1 mi) wide.
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SI, and hence the use of "km/h" (or "km h −1 " or "km·h −1 ") has now been adopted around the world in many areas related to health and safety [36] and in metrology [37] in addition to the SI unit metres per second ("m/s", "m s −1 " or "m·s −1 "). SI is also the preferred system of measure in academia and in education.