Science & Nature
1439 sites
Subcategories:
- Astronomy & Space (396)
- Chemistry (8)
- Earth Sciences (26)
- Biology (79)
- Physics (30)
- Mathematics (59)
- Weather & Climate (104)
- Amateur Radio (682)
- Electronics (47)
http://bluegrassars.org/
The Bluegrass Amateur Radio Society is a ham radio club based in Lexington, Kentucky, serving local amateur radio enthusiasts. The site represents an organized community group for operators in the Bluegrass region, covering club activities, events, and resources for members.
https://qsl.net/w3mrc
The W3MRC Amateur Radio Club is a ham radio organization based in Austin, Texas, with a web presence on the QSL.net network. The site serves as a basic landing page for the club, last updated in 2013, offering a starting point for local amateur radio enthusiasts in the Austin area.
https://qsl.net/w6efb
The High Desert DX Association (HIDEXA) is a ham radio club based in the High Mojave Desert of California, dedicated to pursuing worldwide DX contacts and making friends around the globe via amateur radio. The site features DX bulletins, contest links, callsign search tools, and member resources including antenna guides, QSL card galleries, and a ham shack tour from webmaster K7HG.
https://dictionary.obspm.fr/
Created by M. Heydari-Malayeri at the Paris Observatory, this trilingual etymological dictionary covers thousands of astronomy and astrophysics concepts in English, French, and Persian, tracing the roots and definitions of terms from the oldest to the newest. It stands out as a freely accessible, interdisciplinary reference that fills a gap left by conventional astronomical glossaries, with entries organized alphabetically and supplemented by historical and linguistic context.
https://vkham.com/
VKHam is a comprehensive Australian amateur radio resource hub run by VK2CA, featuring over 12,000 QSL card images, a directory of 1800+ VK callsigns, repeater maps for all Australian states, and DX information. The site also offers kit and radio manuals, electronics resources, frequency tables, and a classifieds section specifically for the Australian ham radio community.
http://foxdelta.com/
Fox Delta, operated by K7SFN, I2TZK, and VU2FD, is a direct-sales kit shop and project resource for amateur radio enthusiasts, offering RF amplifiers, SWR meters, antenna rotator software, and more. The site features a range of active and previous hardware kits including the PA-100 IRF510 RF amplifier and ST2 USB interface, all sold exclusively through this site with no third-party dealers.
http://panoptesv.com/SciFi/ColorsOfAlienWorlds/AlienSkies.php
A scientifically detailed simulation gallery showing what alien skies would look like on Earth-like worlds orbiting different types of stars, with varying atmospheric pressures and compositions. Each entry features rendered color visualizations depicting sky color at different sun angles, making this a visually rich and technically rigorous reference for astronomy and worldbuilding enthusiasts alike.
http://users.erols.com/njastro/orgs/ndsos.htm
The National Deep Sky Observers Society (NDSOS) is a worldwide amateur astronomy organization founded in 1976, dedicated to those who observe galaxies, nebulae, and star clusters. Members receive a quarterly journal called Betelgeuse, access to professional astronomical databases, and networking with fellow deep sky enthusiasts across the globe.
http://briancoad.com/main.asp
Brian W. Coad, a retired ichthyologist from the Canadian Museum of Nature in Ottawa, shares decades of expertise through resources including a Dictionary of Ichthyology, annotated checklists of Canadian fishes, and detailed studies of freshwater fishes from Iran and Iraq. The site is a remarkable reference collection for anyone interested in fish taxonomy, zoogeography, and biodiversity, with content serious enough to be published as academic papers and books.
http://messier.seds.org/
The SEDS Messier Database is a comprehensive reference for all 110 objects in Charles Messier's famous catalog of nebulae, star clusters, and galaxies, compiled by the French astronomer between 1758 and 1782. Visitors can browse detailed entries with images, follow Messier Marathon news and results, and explore deep sky objects organized by type, making this a go-to resource for amateur astronomers worldwide.