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)
https://people.ast.cam.ac.uk/~jds
The British Astronomical Association Comet Section is a dedicated resource for tracking newly discovered comets, periodic comets, and observational reports from contributors worldwide. Maintained by director Nick James and visual observations coordinator Jonathan Shanklin, the site features comet ephemerides, discovery news, observing guides, and an archive of the newsletter 'The Comet's Tale'.
http://amateurlogic.com/blog
AmateurLogic.TV is a long-running ham radio video show and blog covering radio technology, licensing education through its Ham College series, and hands-on gear topics. With archives stretching back to 2005 and content available on YouTube, Roku, Spotify, and Amazon Prime, it offers an impressive breadth of resources for both new and experienced amateur radio operators.
https://hms.sternhell.at/hms.php?country=Austria&lang=English&page=pages%2Fmain
How Many Stars is a long-running international citizen science project now in its 22nd year, dedicated to measuring light pollution and night sky visibility through naked-eye observations submitted by volunteers worldwide. Participants count visible stars in specific regions and submit their reports, contributing to a global dataset tracking the degradation of dark skies over time.
https://fedastro.org.uk/
The Federation of Astronomical Societies is a UK-based umbrella organization connecting amateur astronomy clubs and societies across Britain. It serves as a hub for coordinating events, sharing resources, and supporting the broader community of stargazers and astronomical enthusiasts in the region.
https://swling.com/blog/2026/03/shelfmarks-and-shortwave
The SWLing Post is a dedicated blog covering shortwave listening, ham radio, DXing, SDR technology, and radio broadcasting from around the world. With reviews, program schedules, equipment guides, and community contributions, it's a rich hub for radio enthusiasts of all stripes.
https://dcara.net/
The Denton County Amateur Radio Association (DCARA) is the official club site for ham radio operators in Denton County, Texas, operating under club call sign W5NGU. Visitors can find information about club meetings, repeater status, license classes, public service events, Field Day activities, and membership details for the North Texas amateur radio community.
https://theodoregray.com/PeriodicTable
Theodore Gray's landmark site documents his handcrafted wooden periodic table desk, which contains actual samples of all 118 chemical elements, with thousands of photos, rotatable 3D images, videos, and detailed information for each element. With over 2,379 samples, 471 minerals, and a wealth of interactive features including an element-spelling game and reaction balancing, this is one of the most thorough and visually stunning chemistry reference sites on the web.
https://500kc.com/
The 500 KC Amateur Radio Experimental Group, run by Ralph M. Hartwell II, documents the WD2XSH experimental station network operating in the 600-meter (500 kHz) band, including reception reports, station maps, frequency assignments, and FCC regulatory updates. A fascinating resource for low-frequency amateur radio enthusiasts, it captures the years-long effort by American hams to secure the new 630-meter band allocation from the FCC.
https://knotplot.com/
Created by Robert G. Scharein, the KnotPlot Site is a visually stunning exploration of mathematical knot theory, featuring hundreds of images and animations generated by the KnotPlot software for Windows, macOS, and Linux. Visitors can browse galleries of torus knots, Celtic knots, hyperbolic knots, Brunnian links, and fractal structures, as well as download the KnotPlot program itself to visualize and manipulate knots in three and four dimensions.
https://www.qsl.net/n4xy/index.htm
N4XY's personal site covers a wide range of interests centered on ham radio, including QRP, homebrew equipment, boat anchors, RTTY, antennas, and telegraph keys. Beyond radio, the site branches into photography, tropical and marine fish, orchids, ferns, and family, making it a rich window into a dedicated hobbyist's world.