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://sites.utexas.edu/n5xu
The University of Texas Amateur Radio Club (UTARC) has operated under the callsign N5XU since its founding in 1921, making it one of the longest-running college radio clubs in the country. The site covers club meetings, local nets, repeater information, and resources for getting a ham radio license, with membership open to all UT-affiliated students, faculty, and staff at no cost.
https://weather.ral.ucar.edu/upper
RAL Real-Time Weather's Upper-Air page, maintained by NCAR's Research Applications Laboratory, provides real-time rawinsonde plots and upper-atmosphere wind and temperature data across multiple pressure levels from 925mb to 200mb. Researchers and weather enthusiasts can browse SkewT/LogP charts, loop multi-day animations, and access archived upper-air data sponsored by the NSF National Center for Atmospheric Research.
https://www.qsl.net/la5ki/index.htm
LA5KI Vintage Ham Radio is a Norwegian amateur radio operator's site dedicated to vintage ham radio equipment and history. The page features a classic old-web aesthetic and serves as a gateway to content about antique radio gear and the amateur radio hobby.
https://caacwv.com/
The Central Appalachian Astronomy Club is a 501(c)(3) non-profit based in West Virginia dedicated to promoting amateur astronomy and partnering with local schools and universities. Visitors can learn about the club's 20-foot Ash Dome observatory housing a 16-inch Meade LX200 telescope, upcoming meetings and events, and how to join.
https://qsl.net/gi4fum
David Hutchinson's personal homepage from County Antrim, Northern Ireland, featuring his amateur radio callsign GI4FUM and participation in the Amateur Radio World Ring webring. The site also touches on Antrim District Scouts, archery sports injury resources, and related links, making it a snapshot of a multifaceted Northern Irish hobbyist's online presence.
https://muircom.com/6meters.htm
A reference page by Alan Muir (VE7BEU) documenting 6-meter amateur radio frequencies in the 50-54 MHz band, including repeater pairs used in British Columbia and Washington State. It covers transmitter offsets and CTCSS tones, compiled on behalf of the Westcoast Amateur Radio Association in Victoria for submission to the BC Amateur Radio Coordination Council.
http://rfinq.com/
RF Inquiry Inc. is a Japanese company specializing in amateur and professional radio equipment, selling filters for RFI interference suppression, antennas from brands like OptiBeam and OM Power, and accessories for HF, VHF, and UHF operation. The site serves ham radio operators with a product catalog including bandpass filters, baluns, linear amplifiers, and noise reduction gear from well-known manufacturers.
https://seabean.com/what.asp
Seabean.com is a dedicated reference site exploring the fascinating world of sea-beans and drift seeds, those tropical seeds and fruits that travel ocean currents for thousands of miles before washing ashore. Visitors can learn how sea-beans float, where they originate, and how to identify specific species like Tropical Almond and Hog Plum.
http://astronautica.com/owds.html
Other Worlds, Distant Suns, maintained by Garber Astronautics, is a detailed catalog of extrasolar planets featuring individual pages for dozens of star systems like 51 Pegasi, Gliese 876, and upsilon Andromedae. The site stands out for its interactive VRML 3D visualizations of extrasolar systems, observing guides for both celestial hemispheres, and curated links to leading researchers like Geoff Marcy and Jean Schneider.
https://w5ks.org/
The Lawton Fort Sill Amateur Radio Club (W5KS) is a nonprofit ham radio club based in Lawton, Oklahoma, serving the community since 1949 with a focus on disaster preparedness, STEM education, and operator training. Visitors can find meeting schedules, upcoming net frequencies, free Morse code training sessions, and license testing events hosted by this ARRL-recognized club.