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://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.
http://collembola.org/
A comprehensive scientific checklist of all Collembola (springtails) species in the world, searchable by taxon and linked to global distribution maps at family, genus, and species levels. The site also includes biology overviews, identification guides, collecting techniques, bibliographies, and images, making it an invaluable reference for entomologists and naturalists.
https://deepimpact.astro.umd.edu/
The official University of Maryland archive for NASA's Deep Impact mission, which sent a spacecraft to collide with comet Tempel 1 in 2005 and later extended its mission as EPOXI to observe comet Hartley 2 and distant exoplanets. The site preserves science results, image and video galleries, team member profiles, and mission history through the spacecraft's final loss of contact in 2013.
http://vacuumtubes.com/
Vacuumtubes.com, run by Jonathan Oas out of Hartland, MN, is an online storefront selling vacuum tubes, electron tubes, tube testers, tube sockets, and related electronic parts organized into extensive alphabetical tube lists. The inventory spans everything from rare Western Electric and antique tubes to popular audio types like the 12AX7, 6L6, and EL34, making it a go-to source for vintage audio and electronics enthusiasts.
http://marsradio.net/MARSmain
The Metropolitan Amateur Repeater System is the official site for a Los Angeles-area ham radio repeater network founded in 1993, operating on 447.820 MHz and linked 24/7 to a Missouri repeater via EchoLink. Beyond repeater info, the site offers local earthquake reports, weather, and traffic resources for Southern California ham operators.
https://cnharc.org/
The Central NH Amateur Radio Club (CNHARC) is a 501(c3) non-profit organization serving ham radio enthusiasts in central New Hampshire, with club meetings, repeater information, newsletters, and member resources. Visitors can find meeting schedules covering topics like Software Defined Radio technology, net control schedules, mentoring programs, and a members gear-for-sale page.
http://laughingpoliceman.com/
The Laughing Policeman Wireless Society (LPWS) is a long-running alternative amateur radio club founded in 1978, dedicated to celebrating the humorous and absurd side of the hobby through audio recordings, court cases involving radio pirates, repeater antics, and radio buffoonery. The site is packed with sections covering pirate radio, CB court cases, Russian jammers, CTCSS tones, and even a "History of Swearing," making it a uniquely entertaining corner of the amateur radio world.
https://stormeffects.com/
Brian Morganti's StormEffects is a personal site dedicated to storm chasing, featuring an extensive collection of storm and landscape photos, chase videos, and chase summaries from real weather events. The site also touches on astrophotography, making it a rich visual record of one enthusiast's pursuit of dramatic natural phenomena.
https://asgh.org/legacy/links.htm
The Astronomical Society of Greenwich Hills (ASGH) maintains this curated links page connecting amateur astronomers to periodicals, regional astronomy clubs, observatories, equipment suppliers, and NASA educational resources. A thorough reference hub for stargazers in Connecticut and New England, it lists dozens of affiliated clubs and organizations alongside tools for both hobbyists and kids.
https://www.qsl.net/mvarg
The Mystic Valley Amateur Radio Group is a club based in eastern Massachusetts that meets monthly at Tufts University in Medford, welcoming anyone interested in the amateur radio hobby. The site lists club officers, repeater information, and a variety of ham radio links including ARRL resources, emergency management contacts, and local net listings.