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://www.qsl.net/barc
The Bristol Amateur Radio Club (BARC) serves ham radio enthusiasts in the Bristol, TN/VA area, with information about their local FM and C4FM repeaters, monthly meetings, newsletters, and contesting activities. A long-running club site hosted on QSL.NET, it connects members and visitors to resources for advancing amateur radio knowledge and community involvement.
http://jgiesen.de/welcomeEnglish.htm
A rich hobbyist resource by J. Giesen featuring an extensive collection of Java and JavaScript applets covering astronomy topics like sun and moon phases, planet positions, sundials, Venus transits, and satellite observation. Visitors will also find physics quizzes, chaos and fractal simulations, color theory tools, and links to books and software, making it a deep interactive playground for science enthusiasts.
http://nsradio.org/
The North Shore Radio Association (NSRA) serves amateur radio operators in the Peabody and Danvers, Massachusetts area, coordinating weekly club nets on the 145.470MHz repeater and organizing VE licensing exam sessions. The site provides members with information on club meetings, ARES/Skywarn emergency communications, DMR digital radio, and public service activities.
https://hfpropagation.com/
A continually updated reference tool for ham radio operators providing usable HF propagation frequencies and forecasts from major U.S. base cities to regions around the world. Color-coded charts, ionograms, and geomagnetic and solar data make it a practical real-time resource for planning amateur radio contacts.
http://selarc.org/
SELARC is the Southeast Louisiana Amateur Radio Club, serving the Hammond and Tangipahoa area with repeater listings, hamfest event info, ARES emergency communications resources, and monthly newsletters. The site covers everything from FCC licensing and packet radio to amateur radio satellites, making it a solid hub for local hams in the region.
https://math.toronto.edu/mathnet/games/towers.html
Part of the University of Toronto Mathematics Network, this page explores the classic Tower of Hanoi puzzle through its legendary origins, an interactive playable version, and a deep dive into the mathematical patterns it reveals. Created by Philip Spencer, it connects the puzzle to concepts like Hamiltonian paths and higher-dimensional geometry, making it a genuinely enriching educational resource.
https://soho.nascom.nasa.gov/data/realtime/realtime-update.html
NASA's SOHO (Solar and Heliospheric Observatory) mission serves up the very latest real-time solar images captured by instruments including EIT, LASCO, and SDO/HMI, updated continuously from the spacecraft. Visitors can explore the sun in multiple wavelengths and coronagraph views, making this an invaluable resource for solar observers, space weather enthusiasts, and researchers alike.
https://kb0dco.tripod.com/
KB0DCO's ham radio homepage serves as both a personal shack page and an informal hub for the Crow River Amateur Radio Club in Minnesota, featuring DX logs, a QSL gallery, repeater and net information, and club event updates. The operator is active in ARES, Metro SkyWarn, and serves as Highway Committee and Field Day Chairman, making this a well-rounded window into a busy ham's on-air and community life.
https://realhamradio.com/
K8CU's amateur radio station site features well-documented technical construction projects including high-power GS35B RF amplifiers, HF log periodic antennas, GPS frequency standards, and Six meter equipment. Vintage receiver restoration, mobile RFI solutions, and detailed technical articles make this a rich resource for serious radio amateurs worldwide.
http://feraphotography.com/
Bob and Janice Fera share their passion for astrophotography on this dedicated site showcasing celestial images captured by the husband-and-wife team. Visitors can explore their collection of deep-sky and astronomical photographs, making it a compelling destination for amateur astronomy and night-sky imaging enthusiasts.