A trio of researchers from the National Astronomical Research Institute of Thailand, Université de Lyon and Sorbonne Université, respectively, has made the first sighting of a quadruple asteroid system—an asteroid with ...
With the recent announcement of the asteroid mining company, Planetary Resources, some of the most-asked questions about this enticing but complex endeavor include, what asteroids do we mine? Which are the easiest asteroids ...
Space Exploration
May 17, 2012
60
0
The risk is growing that Earth will be hit by an asteroid from a meteor stream known as the Taurids, Czech astronomers said on Tuesday.
Space Exploration
Jun 6, 2017
11
221
One of the rare scientific reports on the rarest form of lightning—ball lightning—describes better ways of producing this mysterious phenomenon under the modern laboratory conditions needed to explain it. The new study ...
General Physics
Aug 7, 2013
12
0
(Phys.org) —Miniaturized bioelectronic probes stand to transform biology and medicine by allowing measurement of intracellular components in vivo. Recently, scientists at Harvard University and Peking University designed, ...
(Phys.org)—A team made up of members from several European countries has published a paper in Physical Review Letters describing a technique they've developed for using fractal geometry to build structures that maintain ...
Older, large-diameter trees have been shown to store disproportionally massive amounts of carbon compared to smaller trees, highlighting their importance in mitigating climate change, according to a new study in Frontiers ...
Environment
Nov 5, 2020
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5828
An article published in Physical Review E and conducted by Spanish researchers at the universities of Granada and Barcelona might lead to a revolutionary change in water desalination and filtration methods.
Soft Matter
Feb 24, 2012
2
0
NASA is debating whether to try to fix a jammed solar panel on its newly launched Lucy spacecraft, en route to explore an unprecedented number of asteroids.
Space Exploration
Oct 28, 2021
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95
A team of researchers from Osaka University and Kirin Holdings Company, Limited demonstrated that the texture formation in a pint glass of Guinness beer is induced by flow of a bubble-free fluid film flowing down along the ...
General Physics
May 8, 2019
0
1474
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle. The word "diameter" derives from Greek διάμετρος (diametros), "diagonal of a circle", from δια- (dia-), "across, through" + μέτρον (metron), "a measure").
In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter, because all diameters of a circle have the same length, this being twice the radius.
For a convex shape in the plane, the diameter is defined to be the largest distance that can be formed between two opposite parallel lines tangent to its boundary, and the width is defined to be the smallest such distance. For a curve of constant width such as the Reuleaux triangle, the width and diameter are the same because all such pairs of parallel tangent lines have the same distance. See also Tangent lines to circles.
This text uses material from Wikipedia, licensed under CC BY-SA
