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://nautiloid.net/fossils/sites/mazon/mazon.html
A firsthand account of fossil hunting at the Mazon Creek site in Illinois, one of the world's most celebrated locations for soft-body fauna preservation found inside concretions. The author shares photos, practical tips on finding nodules, and personal observations from multiple visits to this unique strip-mine-turned-wildlife-preserve.
https://pk3.org/Astro/index.htm?k3ccdtools.htm=
Peter Katreniak's astronomy page covers CCD imaging and observations of planets, the Moon, the Sun, eclipses, and deep-sky objects. A hobbyist astronomer's showcase featuring telescope photography and tools like K3CCDTools, making it a great find for amateur astrophotographers.
http://worldofradio.com/anomaly.html
World of Radio is a long-running shortwave and DX radio program archive, offering hundreds of downloadable and streamable MP3 episodes spanning 2019 through 2026. The site also tracks the DX Listening Digest and anomaly alerts, making it an essential resource for shortwave listeners and DXers worldwide.
https://macastro.org.au/
The Macarthur Astronomical Society serves amateur astronomers in Sydney's south west, offering field nights at multiple observation sites, astro imaging workshops, citizen science projects, and a Deep Space Hunt program. With resources like the Messier and Caldwell lists, ISS tracking, sky conditions, and a 2028 Solar Eclipse planning page, this is a well-rounded hub for a genuinely active local astronomy club.
http://big.or.jp/~ham/dx.html
A long-running DX information hub operated by Waiwai Ham Life, aggregating 50MHz DX cluster data from Japan with archives stretching back to 1998. The site covers HF DX, EME, 144MHz, and satellite contacts, and includes links to callbooks, DXCC lists, IOTA lists, and logging software for serious DXers.
http://badastronomy.com/index.html
Phil Plait, astronomer and science communicator, built this site to debunk widespread myths and misconceptions about astronomy, from Moon landing hoax claims to equinox egg-balancing folklore. With sections covering movies, news, TV, and bite-sized astronomy lessons, it is a rich resource for anyone wanting to separate cosmic fact from fiction.
https://sharc.net/
The South Hills Amateur Radio Club (SHARC) is a 501(c)(3) non-profit based in Pittsburgh, Pennsylvania, serving ham radio enthusiasts across the South Hills region with callsigns KS3R, N3WX, and W3PIT. The site offers detailed information on club repeaters, Field Day events, membership, VE testing schedules, and an extensive swap-and-shop classifieds section for amateur radio equipment.
https://vu2ese.com/
Ashhar Farhan (VU2ESE) is an Indian radio amateur who designs and builds his own transceivers, SDRs, and test equipment, sharing full schematics and source code freely with the builder community. Highlights include the BITX SSB transceiver, the hackable sBitx SDR with integrated FT8 support, and a growing collection of homebrew test gear like spectrum analyzers and tone generators.
https://astrosystems.biz/
AstroSystems is a Colorado-based manufacturer selling telescope kits, accessories, and components including their signature TeleKit truss tube Dobsonians, secondary mirrors, laser collimators, and digital setting circles. With worldwide shipping and a broad catalog spanning fast f/ratio optics to dew removal systems, this site is a go-to resource for amateur telescope makers and Dobsonian enthusiasts.
http://ka6wke.blogspot.com/
Mark Schoonover (KA6WKE) shares his amateur radio experiences, including homebrew antenna tuner builds, HF mobile setups, and equipment reviews for his IC-7000 and IC-706MKIIg rigs. The site features hands-on technical posts about Z-match tuners, horizontal loops, and ladder line feeding, making it a useful read for hams interested in practical antenna projects.