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://clarc.org/
The Clear Lake Amateur Radio Club (CLARC), operating under callsign K5HOU, has served the Clear Lake, Texas area since 1987 as an ARRL Special Service Club. Visitors can find information about weekly nets on the club's repeaters, licensing exams, Hamster Classes, and community communications support for public events.
https://n3yrw.tripod.com/index-3.html
Frank N3YRW's ham radio link collection is a curated gateway to the world of amateur radio, covering DX hunting, callsign lookups, equipment dealers, antennas, and upcoming DXpeditions. Packed with dozens of links to resources like QRZ, ARRL, Icom, Yaesu, and DX clusters, this page is a handy one-stop reference for hams of all experience levels.
https://scanwarewebhost.com/
G. McAvoy (KG7XD) built this resource hub centered on radio scanning, featuring a live FCC database query tool for all US AM, FM, and TV stations. Quick-links to scanner frequencies, fire, police, EMS, ham radio resources, and weather make it a handy reference for radio enthusiasts.
https://rainbowspec.observer/
RainbowSpec is an in-depth yet beginner-friendly educational site exploring how rainbows and color work, covering everything from the visible spectrum and refraction to supernumerary rainbows, fogbows, glories, and thin film interference. The site is thoughtfully organized with starred pages marking foundational concepts, and it links to classic atmospheric optics references that inspired its creation.
http://sten.astronomycafe.net/the-astronomy-cafe
NASA scientist-educator Sten Odenwald has maintained this astronomy education hub for over 20 years, filling it with popular essays on cosmology, black holes, space travel, and the weird corners of nature. Visitors will find Q&A resources, blog posts on recent space discoveries, and details on his published books including a photo-filled history of space exploration through 100 iconic objects.
http://astronautix.com/
Encyclopedia Astronautica is a massive reference work by Mark Wade covering the complete history of human spaceflight, with over 79,000 pages on rockets, spacecraft, astronauts, cosmonauts, launch sites, and engines from every spacefaring nation. Spanning Soviet secret programs to cancelled American spacecraft, it is one of the most comprehensive space history archives ever assembled on the web.
https://n4gn.com/sr
Tim Totten (N4GN) built this dedicated archive for the 1997 BS7H amateur radio DXpedition to Scarborough Reef, one of the rarest DXCC entities in the world. Visitors can search the expedition's QSO log, review operating frequencies and bulletins, meet the operating team, and explore QSL card information from this historic contact event.
http://abmedia.com/astro
Chris Cook's extensive astrophotography portfolio spans nearly four decades of celestial imaging, featuring deep sky objects, comets, eclipses, auroras, and stunning nightscape photography captured on both film and digital equipment. With NASA APOD features, astrophotography workshops, and a vast archive organized by technique and subject, this is a remarkable showcase of dedication to the craft.
https://marc-hq.org/
The Motorcycling Amateur Radio Club (MARC) is a community group that combines motorcycle riding with ham radio operation to support charity fundraising events like Bike MS rides in Southern California. The site includes a tech center, photo gallery, newsletters, event calendar, and membership information for riders and operators who want to combine their passions while giving back.
https://shallowsky.com/jupiter.html
Akkana Peck's Juplet page offers a Java applet and JavaScript tool for tracking the positions of Jupiter's four Galilean moons, their shadows, and the Great Red Spot in real time. A labor of love rooted in real astronomical calculations from Jean Meeus' algorithms, the page also includes telescope sketches, links to Jupiter observation resources, and satellite event data.