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://flemingastrophotography.com/
Neil Fleming's astrophotography showcase specializes in deep-sky imaging using the Meade DSI CCD camera, capturing galaxies, nebulae, and star clusters. The site highlights work done with high-end equipment including an NP-127 refractor and NJP mount, making it a compelling destination for amateur astronomers interested in CCD imaging techniques.
http://rfchoke.com/
A technical reference site dedicated to RF chokes, ferrite cores, and related radio frequency electronics components used in amateur radio and RF engineering applications. Visitors will find practical information on choke design, impedance characteristics, and suppression of common-mode currents on antenna feedlines.
http://vk2zay.net/
Alan Yates (VK2ZAY) runs a sprawling electronics and amateur radio laboratory notebook covering homebrew circuits, microcontrollers, high voltage experiments, pyrotechnics, antennas, and much more. With over 260 articles, engineering calculators, and an annual Advent Calendar of Circuits series, this is a genuine treasure trove for hands-on electronics hobbyists.
http://einstein.stanford.edu/
The official site for NASA's Gravity Probe B mission, a Stanford University experiment designed to test two key predictions of Einstein's general theory of relativity using ultra-precise gyroscopes orbiting Earth. Visitors can explore the mission's history dating back to 1959, the groundbreaking engineering advances required to make it possible, technical papers, image galleries, and video overviews of spacetime concepts.
https://astroring.auroradynia.com/
The Astronomy Webring, hosted by auroradynia, connects enthusiasts of astronomy, astrophotography, and astrophysics across the old web. Visitors can join the ring, browse the member list, or simply hop between sites dedicated to all things space.
https://kk4das.blogspot.com/
KK4DAS is a ham radio blog by an enthusiastic homebrew builder documenting the construction of transceivers, antennas, and test equipment from scratch. Posts dive deep into technical details like crystal ladder filters, diode ring mixers, and VFO modules, making it a treasure trove for QRP and homebrew radio enthusiasts.
https://do1mj.de/
Marc, callsign DO1MJ, documents his amateur radio journey after earning his license in January 2022, with a strong focus on SOTA (Summits on the Air) activations across Germany, Slovenia, and beyond. Posts cover field equipment, Yaesu radio tips, mountain hikes combined with radio activations, and practical techniques for lightweight portable operating.
https://qsl.net/ucc
The Ukrainian Contest Club (UCC) is a ham radio organization dedicated to amateur radio contesting in Ukraine, with a notable HamFest event from 2002. The site uses a frames-based navigation system typical of early 2000s web design, suggesting a club hub with member resources and contest information.
https://jedaler.tripod.com/elec.html
Jedaler's Electronics Page, built by JaKab-Daniel, is a curated link collection focused on circuit schematics, microcontrollers, RF antennas, robotics, and hobby electronics projects. Visitors will find references to PIC microcontroller resources, Tesla-related circuits, xenon flash designs, and free energy machine plans alongside general electronics archives.
https://ac6v.com/
AC6V's Amateur Radio and DX Reference Guide is a massive archive built by Rod Dinkins (AC6V) covering 700 amateur radio topics across 133 pages and over 6,000 links. From antenna homebrew projects and propagation guides to licensing help and contest pages, this long-running site has been an essential reference for ham radio operators since 1997.