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://dra73.org/
The Delaware Repeater Association (DRA) is a ham radio club founded in 1973 that maintains repeaters across Delaware and holds quarterly in-person meetings at the Route 40 Diner in Bear, DE with a Zoom option for remote members. The site covers club membership, dues, leadership, meeting schedules, and links to regional amateur radio resources including ARES groups and VE testing.
https://w3eax.umd.edu/
W3EAX is the Amateur Radio Association at the University of Maryland, a student club with roots going back to 1933 and an ARRL-affiliated callsign. Their well-equipped shack includes HF, UHF/VHF, Amateur Television, and satellite gear, plus a full electronics workbench for hands-on radio experience.
http://faqs.org/faqs/space
The faqs.org Space Index is a comprehensive archive of Usenet FAQs dedicated to astronomy and space topics, covering everything from acronyms and data sources to how to become an astronaut and controversial space questions. Maintained across dozens of indexed documents, it serves as a structured reference hub for space enthusiasts and researchers seeking archived FAQ documents from the early internet era.
http://inconstantmoon.com/
Inconstant Moon offers nightly multimedia tours of the lunar surface, complete with maps, photos, animations, and music to guide both beginners and experienced observers through the Moon's craters, seas, and phenomena. A Scientific American Sci/Tech Web Awards honoree and BBC Space featured site, it includes a Cyclopedia Selenica and Selenographia making it a comprehensive reference for lunar astronomy.
https://shallowsky.com/moon/moonlinks.html
A comprehensive curated link collection for amateur lunar observers, gathering moon maps, photographic atlases, observing guides, and software tools from across the early web. Part of the broader Hitchhiker's Guide to the Moon project at Shallow Sky, it serves as an invaluable jumping-off point for anyone wanting to study the moon's features in depth.
https://w6ze.org/
The Orange County Amateur Radio Club (OCARC) has been serving Southern California ham radio enthusiasts since 1934, making it one of the longest-running ARRL-affiliated clubs in the region. Visitors will find meeting schedules, club nets, emergency communications info, a newsletter archive, VE testing sessions, and resources covering everything from satellite communications to digital modes like FT8 and D-STAR.
http://foxtango.org/foxtango001.htm
Fox Tango International is a long-running Yaesu users group established in 1972, dedicated to owners and enthusiasts of Yaesu radio equipment. The site hosts technical manuals, modification pages, classified ads, and historical looks at vintage Yaesu transceivers from the 1960s through today.
https://solorb.com/elect
FC's Electronic Circuits is a sprawling hobbyist archive packed with schematics and project descriptions covering everything from solar charge controllers and LED circuits to tube amplifiers, Geiger counters, and amateur radio gear. With dozens of original circuit designs, Arduino projects, and links to related ham radio and electronics builders, this site is a goldmine for DIY electronics enthusiasts.
http://setileague.org/
The SETI League is a nonprofit membership organization dedicated to the privatized electromagnetic search for extraterrestrial intelligence, coordinating amateur radio astronomers worldwide in the hunt for signals from other civilizations. The site offers extensive technical resources covering antennas, receivers, and software, alongside publications, press releases, and the popular "Ask Dr. SETI" column.
https://www.qsl.net/w3sz
Roger Rehr's W3SZ page is a long-running amateur radio site hosted on QSL.net, active from 1997 to 2007. The callsign W3SZ and the QSL.net hosting strongly indicate a ham radio enthusiast's personal presence on the web.