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://calendarzone.com/
The Calendar Zone, created by Janice McLean, is a comprehensive categorized directory of calendar-related links covering art, celestial, cultural, religious, historical, and reform topics. With over 7 million visitors since 1999, it serves as a one-stop hub for anyone curious about calendar systems, moon phases, lunar cycles, and the history of timekeeping across cultures.
http://n0hr.com/
N0HR.com is a hub for amateur radio operators, offering PocketPC ham radio software including MobileLog 2 for contact logging, PPCMorse for learning Morse code, and PocketDigi for digital modes like PSK31 and RTTY. The site also features a large curated and user-rated ham radio links directory, HF propagation tools, a DXPedition map, and a blog covering tower projects, contests, and DX activity.
https://www2.mmm.ucar.edu/imagearchive
Hosted by UCAR's Mesoscale and Microscale Meteorology Laboratory, this archive provides a collection of meteorological case study images for researchers and forecasters. The Case Selection Kit Image Archive serves as a reference tool for selecting and studying atmospheric weather cases, making it a useful resource for those in the meteorological sciences.
https://astronomyclub.org/share/links.htm
A curated links directory from an astronomy club, organizing resources into categories covering amateur astronomy groups across the southern US, national organizations, NASA resources, observatories, and telescoping guides. It serves as a handy launchpad for stargazers at any level, connecting visitors to everything from local star parties to Hubble gallery images.
https://www.qsl.net/k4gc
K4GC Bryan's amateur radio page focuses on the art of building homebrew transmitters and receivers, showcasing projects like a 6L6 tube transmitter. Bryan shares his passion for collecting hard-to-find vintage radio parts including tube sockets, variable capacitors, and boat anchor components accumulated over more than twenty years.
https://qsl.net/see
The Society of Ether Explorers (K6SEE) is a San Francisco amateur radio club of experimenters, hackers, and tinkerers focused on esoteric and unusual aspects of wireless communication. Their site documents club members, ongoing projects like the 33cm repeater conversion effort (Project 33), ATV repeating, and remote base control builds from the late 1990s.
https://grace.umd.edu/~tlaloc/archastro
The official web presence of the Center for Archaeoastronomy, a professional research organization founded at the University of Maryland in 1978, dedicated to the interdisciplinary study of astronomy in ancient and indigenous cultures. Visitors can explore peer-reviewed publications, newsletters, essays on ethnoastronomy, and learn about ISAAC, the international society promoting archaeoastronomy worldwide.
http://thehellhole.com/
A detailed German-language educational site covering black holes and singularities, exploring topics from stellar and supermassive black holes to Hawking radiation, mathematical models, and even the theoretical dangers of black holes at CERN. The site draws a fascinating parallel between modern astrophysics and Norse mythology's concept of the Maelstrom, making complex science accessible through storytelling.
http://sk3bg.se/contest
SM3CER Contest Service, run by Jan-Eric Rehn of Sweden, is a comprehensive hub for amateur radio contesters featuring a worldwide contest calendar, contest rules, results, and software links. Active since 1997, the site aggregates mailing lists, DX spotting tools, callsign lookups, and contest-related resources that make it an indispensable reference for serious ham radio operators.
https://www.qsl.net/ng3p
Gwen Patton (callsign NG3P) shares her journey into amateur radio, from childhood fascination with a massive Navy surplus shortwave receiver to earning her No-Code Technician license in 1999 and building an impressive shack. The site details her radio equipment including Yaesu, Alinco, and ICOM rigs, her QRP interests, and connects to ham radio webrings.