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://dk7ih.de/2022/05/new-post-a-walkie-talkie-ssb-transceiver-for-14mhz-or-the-higher-rf-bands
DK7IH is the personal engineering site of Peter Rachow, a radio amateur who documents his homebrew SSB transceiver builds including QRP multiband rigs, walkie-talkie style transceivers, and SMD-based designs for the 14MHz band and beyond. The site is a detailed technical resource for ham radio enthusiasts interested in hands-on RF circuit construction and design.
https://n7kom.com/
N7KOM is the personal site of a Pacific Northwest ham radio operator specializing in QRP portable operations and Summits On The Air (SOTA) activations. Visitors will find a QRP trap kit build guide, a getting-started SOTA resource, and links to a YouTube channel, stickers, and the Cascadia Radio Discord community.
https://www.qsl.net/fwdxa
The Fort Wayne DX Association (FWDXA) is a Northeast Indiana amateur radio club founded in 1975, bringing together DXers for contests, DXpeditions, and bimonthly meetings. The site includes sections on DX operations, a contest calendar, member pages, historical QSL cards, and Top Band musings, making it a solid hub for regional ham radio enthusiasts.
https://atmob.org/
The Amateur Telescope Makers of Boston (ATMoB) is a 501(c)3 nonprofit astronomy club that meets monthly at the Harvard-Smithsonian Center for Astrophysics, welcoming the public to join in observing, telescope making, and outreach events. The site offers club history, star party schedules, a clubhouse sky-conditions monitor, photo albums, and resources for getting started in amateur astronomy.
http://nrrt.org/
The Newton Radio Response Team is a community emergency communications group based in Newton, likely coordinating amateur radio operators for public safety and disaster response. Sites like this serve as a hub for volunteer ham radio operators who support local emergency services when standard communications fail.
http://stars.astro.illinois.edu/sow/spectra.html
Jim Kaler's comprehensive guide to stellar spectra covers everything from absorption and emission lines to the Doppler effect and spectral classification, all richly illustrated with images of rainbows, nebulae, and spectrograms. Part of Kaler's broader STARS educational project hosted at the University of Illinois, this deep-dive reference explains how astronomers decode the physical and chemical nature of stars through the light they emit.
https://dsimanek.vialattea.net/home.htm
Donald Simanek, a physics professor, has assembled a sprawling collection of resources covering physics puzzles, perpetual motion machines, pseudoscience debunking, creationism criticism, and science humor. Highlights include the Museum of Unworkable Devices, illustrated lectures, and a rich archive of skeptical and educational content that has earned recognition as one of the top skeptical websites on the web.
https://ads.harvard.edu/books
The NASA Astrophysics Data System (ADS) Virtual Library offers free online access to a curated collection of astronomy and astrophysics books, ranging from Copernicus's 1543 classic to modern astrophysics textbooks. Researchers and enthusiasts alike can browse and print foundational works on celestial mechanics, stellar astrophysics, lunar science, and solar physics from leading institutions like Harvard and the Lunar and Planetary Institute.
https://greensboroastronomyclub.org/
The Greensboro Astronomy Club is a North Carolina-based group dedicated to making astronomy accessible to the public through regular meetings, observing sessions, and educational events. The site highlights upcoming meetings at venues like the Greensboro Science Center, member achievements, and the club's advocacy for preserving astronomy programs at local universities.
https://mrao.cam.ac.uk/surveys/snrs
Maintained by D. A. Green at the Cavendish Laboratory in Cambridge, this is a comprehensive scientific catalogue of 310 known Galactic supernova remnants, updated through October 2024. It includes detailed listings, alternate names, summary data, and links to astrophysics literature via the ADS system, making it an essential reference for researchers and astronomy enthusiasts alike.