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://planetary.chem.tufts.edu/Phoenix/index.html
A page dedicated to NASA's Phoenix Mars Scout Mission, hosted on a Tufts University chemistry server, featuring launch videos including a close-up NASA recording and a team footage from Cocoa Beach in August 2007. It offers a glimpse into the excitement surrounding the Phoenix lander's launch, which went on to study the Martian arctic soil.
http://hamradio.dk/
The official site of EDR København, the Copenhagen chapter of the Danish Amateur Radio Society, operating under the callsign OZ5EDR. A hub for Danish ham radio enthusiasts, covering club activities, news, and resources for the amateur radio community in Copenhagen.
https://users.usinternet.com/n0flq
Collin Witwer (N0FLQ) is a ham radio operator from Minneapolis, Minnesota who built this sprawling personal homepage packed with categorized links covering everything from ham radio and shortwave to space, electronics, weather, and beyond. The site serves as both a personal hub and a massive curated web directory, with a QSL card, live webcam, and links to local Minnesota resources making it a genuine snapshot of late-1990s hobbyist internet culture.
https://solarviews.com/eng/mars.htm
Calvin J. Hamilton's comprehensive Mars reference page covers everything from the planet's geology and atmosphere to its moons, polar regions, and exploration missions like Viking, Pathfinder, and the Mars Rovers. Packed with images, animations, 3D galleries, and scientific articles, it serves as a deep-dive educational hub for anyone fascinated by the Red Planet.
http://srgclub.org/
Karl Shoemaker (AK2O) runs this ham radio resource dedicated to the SRG Club's 147.20 MHz repeater network covering Eastern Washington and Northern Idaho, with linking to Seattle. The site dives into technical repeater building topics including flat audio, operational amplifiers, PCB work, receiver audio boards, and repeater controllers.
https://ve7sar.blogspot.com/
The digital home of the SARC Communicator, the newsletter of Surrey Amateur Radio Communications (VE7SAR) based in Surrey, BC, Canada. Each issue is packed with homebrew projects, DX expedition reports, radio history features, and equipment reviews, making it a rich resource for ham radio enthusiasts of all experience levels.
https://atmos.uw.edu/marka/wa.normals.html
Hosted on the University of Washington's atmospheric sciences domain, this page presents observed climate normals for Washington State covering the 1971-2000 period. Visitors can click on map markers to retrieve mean monthly precipitation, daily maximum temperature, and daily minimum temperature data for locations across the state.
http://dfma.org/
The Durham FM Association (DFMA) is an amateur radio club based in Durham, North Carolina, serving members across the Research Triangle Area with repeaters, monthly meetings, and public service activities. The site covers club events, repeater information, newsletters, ARES/AUXCOMM support, and Field Day activities, making it a central hub for local ham radio enthusiasts.
http://laughton.com/paul/rfo/rfo.html
Named in honor of Nobel Prize-winning physicist Richard Feynman, this amateur astronomy site showcases CCD astrophotography of nebulae, planets, and galaxies captured through telescopes ranging from a 4-inch Takahashi to a Celestron C11. Visitors will find detailed equipment reviews, imaging guides, comet and planet sequences, and a rich gallery of deep-sky objects including the Horsehead Nebula, M42, and Hale-Bopp.
http://hfpower.com/
ACOM is a manufacturer of HF linear amplifiers and related amateur radio equipment, including the flagship ACOM 2000A automatic amplifier and the ACOM 1000A. The site serves as a product hub for serious ham radio operators seeking high-power amplification solutions built around tubes like the Svetlana 4CX800A.