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://sm0vpo.altervista.org/
Harry Lythall (SM0VPO/G4VVJ) shares an extensive collection of homebrew amateur radio construction projects, covering everything from QRP transmitters and receivers to circuit boards, oscillators, and RF amplifiers. The site is a treasure trove for hands-on ham radio enthusiasts, packed with schematics, datasheets, calculators, and practical guides for building your own radio equipment.
https://rammb-data.cira.colostate.edu/tc_realtime
Run by NOAA's Regional and Mesoscale Meteorology Branch at Colorado State University, this site tracks currently active tropical cyclones worldwide in real time using satellite imagery and meteorological data. Researchers and weather enthusiasts can browse live storm data, archived seasons going back to 2006, and products developed by NESDIS/STAR/RAMMB scientists.
http://cvafresno.org/
The Central Valley Astronomers is an amateur astronomy club based in Fresno, California, welcoming everyone from beginners to seasoned professionals with star parties, astrophotography, and educational meetings. The site includes a club calendar, membership info, a Young Astronomer Program, star party etiquette guides, light pollution resources, and tips on purchasing equipment.
https://ei7gl.blogspot.com/2026/02/video-solar-cycle-25-expectations-in.html
John, EI7GL, runs this long-running amateur radio diary covering propagation experiments, solar cycle updates, and band activity across frequencies from medium wave to microwaves. The site is a treasure trove for radio enthusiasts, featuring detailed posts on DX contacts, digital modes, and radio science with an impressive archive of callsigns and events.
https://www.qsl.net/wa6bgs
The Amateur Radio Club of El Cajon (WA6BGS) is an ARRL Special Service Club serving San Diego County, with information on monthly meetings, membership applications, and T-Hunting activities. The site includes a preserved 2005 version for historical reference alongside solar and geomagnetic field status indicators popular among ham radio operators.
http://zl2ctm.blogspot.com/
Charlie Morris (ZL2CTM) documents his amateur radio homebrew experiments on this technical blog, sharing detailed projects like a 40m Pelican Case SSB transceiver complete with Arduino code for LCD displays and Si5351 synthesizers. A great resource for ham radio enthusiasts interested in building their own transceivers and RF circuits from scratch.
http://qsl.at/
DokuFunk is the world's largest archive dedicated to the history of radio and electronic media, based in Vienna with worldwide membership and over six million objects in its collection. The organization focuses on both broadcast radio and amateur radio history, preserving QSL cards and other radio-related artifacts under the motto 'No future without origins.'
https://www.qsl.net/kc0afx
Oleksandr Dzyubuk (callsign KC0AFX, home call UX7CQ) runs this site from Cherkassy, Ukraine, offering handmade CW Morse keys for sale alongside information about his ham radio activities and local radio communication work. The site also features a radio museum showcasing vintage USSR radios and receivers, plus sections on Ukrainian culture, power tubes, relays, and RF components.
http://davidmalin.com/fujii/fujii_index.html
A stunning image gallery showcasing the complete Akira Fujii and David Malin Images (DMI) collection of astrophotography, organized into categories including constellations, Milky Way, star trails, solar eclipses, comets, and aurorae. The collection features wide-field photographs of the southern sky taken from Australian observatories, capturing objects like the Southern Cross, Carina Nebula, and Comet McNaught with remarkable detail.
https://alpo-astronomy.org/
The Association of Lunar and Planetary Observers (ALPO) is a long-running scientific organization connecting amateur and professional astronomers who study the Solar System, with dedicated sections covering everything from Mercury and Venus to comets, meteors, and eclipses. Visitors can access the latest issue of their peer-reviewed journal 'The Strolling Astronomer,' join observing sections, and tap into decades of planetary observation data and community research.