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21 meters – height of High Force waterfall in England; 30.5 meters – length of the lion's mane jellyfish, the largest jellyfish in the world; 33 meters – length of a blue whale, [127] the largest animal on earth, living or extinct, in terms of mass; 39 meters – length of a Supersaurus, the longest-known dinosaur and longest vertebrate [128]
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.
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 ...
A 50 m × 25 m (164 ft × 82 ft) Olympic swimming pool, built to the FR3 minimum depth of 2 metres (6.6 ft) would hold 2,500 m 3 (660,000 US gal). The US National Institute of Standards and Technology (NIST) defines the Olympic swimming pool as 1 million litres, which is the approximate volume of the smaller FR2 pool.
Lunar semi-major axis is an important astronomical datum. The few-millimeter precision of the range measurements determines semi-major axis to a few decimeters. It has implications for testing gravitational theories such as general relativity [2] and for refining other astronomical values, such as the mass, [3] radius, [4] and rotation of Earth ...
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.
For instance the same angle of 0.1 mrad will subtend 10 mm at 100 meters, 20 mm at 200 meters, etc., or similarly 0.39 inches at 100 m, 0.78 inches at 200 m, etc. Subtensions in mrad based optics are particularly useful together with target sizes and shooting distances in metric units .
International Space Station (ISS) 1 ′ 3″ [15] the ISS has a width of about 108 m Minimum resolvable diameter by the human eye: 1 ′ [16] 0.3 meter at 1 km distance [17] For visibility of objects with smaller apparent sizes see the necessary apparent magnitudes. About 100 km on the surface of the Moon: 1 ′