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11 meters – approximate width of a doubles tennis court; 15 meters – width of a standard FIBA basketball court; 15.24 meters – width of an NBA basketball court (50 feet) 18.44 meters – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches) [125]
Improving measurements were continually checked and cross-checked by means of improved understanding of the laws of celestial mechanics, which govern the motions of objects in space. The expected positions and distances of objects at an established time are calculated (in au) from these laws, and assembled into a collection of data called an ...
For the small outer irregular moons of Uranus, such as Sycorax, which were not discovered by the Voyager 2 flyby, even different NASA web pages, such as the National Space Science Data Center [6] and JPL Solar System Dynamics, [5] give somewhat contradictory size and albedo estimates depending on which research paper is being cited.
5 × 10 −9 meters Width of the cell membrane: 10 −8 meters — Porcine circovirus — 1.7 × 10 −8 meters Transistor gate — 2.5 × 10 −8 meters Hepatitis B virus — 4.2 × 10 −8 meters Ultraviolet light wavelength 5 × 10 −8 meters 6 × 10 −8 meters Human immunodeficiency virus (HIV) 9 × 10 −8 meters 9 × 10 −8 meters ...
3–5 × 10 8: Volume of all humans alive on the planet (based on an average mass of 40–70 kg per human) 4 × 10 8: Predicted volume of natural gas required per day by India in 2025 5 × 10 8: One sydharb—volume of Sydney Harbour, Australia [6] 6.93 × 10 8: Volume of Lake Murten, Switzerland 1 × 10 ^ 9 m 3 (1.3 × 10 9 cu yd; 1.0 km 3)
The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles).
The Space Surveillance Telescope (SST) is a 3.5 m telescope that detects, tracks, and can discern small, obscure objects, in deep space with a wide field of view system. The SST mount uses an advanced servo-control technology, that makes it one of the quickest and most agile telescopes of its size.
A metric space M is bounded if there is an r such that no pair of points in M is more than distance r apart. [b] The least such r is called the diameter of M. The space M is called precompact or totally bounded if for every r > 0 there is a finite cover of M by open balls of radius r. Every totally bounded space is bounded.