It's springtime on Mars, and the dunes are defrosting
Nothing says springtime on Mars like defrosting dunes.
Planetary Sciences
Mar 17, 2022
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632
News tagged with diameter
First quadruple asteroid system detected
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 ...
Nondestructive testing of optical fiber diameters
The increased use of optical fiber has seen a greater focus on the precise control and measurement of its diameter. That is due to the diameter being vital for a wide range of fields, from high-speed optical communication ...
Optics & Photonics
Nov 29, 2021
0
5
Solar wing jammed on NASA spacecraft chasing asteroids
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
1
95
Fourth-generation wire micrometer that rivals best in the world
Researchers at the National Institute of Standards and Technology (NIST) have developed a dramatically improved laser-based instrument that measures the diameter of fine-gauge wires, fibers and other objects only about three ...
Optics & Photonics
Mar 12, 2021
1
110
The biggest trees capture the most carbon: Large trees dominate carbon storage in forests
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 05, 2020
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5827
Old X-rays, new vision: A nano-focused X-ray laser
Imagine taking movies of the fastest chemical processes, or imaging atomic-scale detail of single virus particles without damaging them. Researchers from Japan have advanced the state-of-the-art in such endeavors, by enhancing ...
Optics & Photonics
Jul 08, 2020
0
1
Impacts on asteroids produce regolith, erase small craters
Impact cratering both produces new regolith and causes seismic events that can degrade and erase small craters on the surface of asteroids, a paper by Planetary Science Institute Senior Scientist James Richardson says.
Space Exploration
Apr 17, 2020
5
196
New study reveals carbon nanotubes measurement possible for the first time
Swansea University scientists have reported a new approach to measuring the conductivity between identical carbon nanotubes which could be used to help improve the efficiency of electrical power cables in the future.
Nanophysics
Aug 22, 2019
0
132
Image: ESA's Large Diameter Centrifuge at full speed
ESA's Large Diameter Centrifuge at the Agency's technical heart in the Netherlands is seen running here at full speed. The 8-m diameter four-arm centrifuge gives researchers access to a range of hypergravity environments ...
Space Exploration
May 22, 2019
0
10
Diameter
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
