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://setiathome.ssl.berkeley.edu/
SETI@home is the legendary UC Berkeley distributed computing project that enlisted millions of volunteers worldwide to analyze radio telescope data in the Search for Extraterrestrial Intelligence. Though now in hibernation and no longer distributing tasks, the site preserves its community message boards, user statistics, and ongoing back-end data analysis efforts that continue to this day.
https://ptri1.tripod.com/
A detailed educational resource dedicated entirely to Pascal's Triangle, covering its construction, history, and the surprising number of patterns hidden within it. Visitors can explore topics ranging from the Fibonacci sequence and Sierpinski fractals to prime numbers and polygonal numbers, with downloadable programs to generate and visualize the triangle's patterns.
https://qsl.net/kc4gzx/kc4gzx/project.htm
KC4GZX is a sprawling amateur radio and electronics resource by a Georgia ham operator, featuring over 2100 DIY homebrew projects spanning antennas, amplifiers, transmitters, microcontrollers, lasers, and more. It also includes a Northeast Georgia ham directory, repeater listings across multiple southeastern states, and a hamfest schedule, making it an invaluable hub for regional and hobbyist radio enthusiasts.
http://dibonsmith.com/graphics.htm
Created by Richard Dibon-Smith, this site provides graphics and reference information for all 88 officially recognized constellations, from Andromeda to Vulpecula. Each constellation gets its own dedicated page, making it a handy visual reference for amateur astronomers and sky-watchers.
https://www.popularastronomyclub.org/astronomy-links
The Popular Astronomy Club's curated links page connects visitors to a rich collection of astronomy resources, from NASA and Sky & Telescope to local observing groups like the Quad Cities Astronomical Society and Niabi Zoo monthly stargazing events. A helpful hub for amateur astronomers in the Midwest, it gathers tools for sky charts, ISS pass predictions, lunar atlases, dark sky advocacy, and more.
https://cadxa.org/
The Central Arizona DX Association (CADXA) is a ham radio club founded in 1974 and based in Arizona, boasting over 100 members many of whom hold ARRL DXCC Honor Roll status. The site offers resources for DXers including QSL card checking, a DX calendar, contest calendars, club rosters, and information on joining one of the largest amateur radio DX clubs in the state.
http://aamerican.com/aclr
The Amateur Cross Link Repeater Club (ACLR) was a Chicago-area ham radio repeater club operating on 147.225MHz that disbanded in 1998 after internal disputes and equipment failures. The site serves as a historical archive of the club's activities, meetings, and Dayton hamfest adventures, maintained by trustees Gregory K9OY and Ann K9OYN.
https://tcfmc.org/
The Twin Cities FM Club (TCFMC) is a Minnesota-based amateur radio organization dedicated to emergency communications, community education, and operating local repeater frequencies for ham radio operators in the Twin Cities area. The site features club nets, a weekly swap shop on 146.76, membership sign-up, and resources on technologies like Wires-X, EchoLink, and AllStarLink.
https://qsl.net/k3mx
The Tri-State DX Association (K3MX) is an amateur radio club based in Matamoras, Pennsylvania, serving operators near the New York and New Jersey borders with a focus on HF DX chasing and contesting. Founded in 1996, the club logs contest results like the Pennsylvania QSO Party and emphasizes emergency traffic handling, international goodwill, and good station engineering.
https://rrra.org/
Red River Radio Amateurs (RRRA) is the official website for an amateur radio club serving the Red River region, featuring club news, event calendars, repeater information, and resources for aspiring ham radio operators. The site covers POTA activations, net schedules, license testing, ARES meetings, and an active blog with technical posts from club members.