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://physlink.com/
Founded in 1995 by physicist Anton Skorucak, PhysLink.com is a comprehensive online portal covering physics and astronomy through reference materials, expert Q&A, physical constants, calculators, and educational articles. Visitors can explore everything from quantum mechanics and general relativity to astronomy news, Nobel Prize info, and even physics humor and cartoons.
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://astronomyedinburgh.org/
The Astronomical Society of Edinburgh has been sharing a love of astronomy since 1924, hosting hybrid in-person and online meetings, observing group sessions, and public talks several times a month. Visitors can explore sky diaries, knowledge articles, beginner observing lists, meteor camera data, and a Messier/Caldwell project archive alongside a live interactive solar system map.
http://scdxc.org/
The Southern California DX Club (SCDXC) is a 77-year-old amateur radio organization focused on DX (long-distance) contacts, bringing together ham radio enthusiasts across the Southern California region. The site hosts membership info, newsletters, a digital library of amateur radio materials, and links to key resources like the ARRL, NCDXF, and QSL bureau services.
https://avastronomyclub.org/
The Antelope Valley Astronomy Club (AVAC) is a nonprofit organization founded in 1982 to share the wonders of the night sky with families in northeastern Los Angeles County. Members range from beginners to advanced observers, and the club offers monthly meetings, school presentations, observing programs, and resources like telescope guides and DSO observing lists.
https://mrasz.hu/
The Magyar Rádióamatőr Szövetség (MRASZ) is the official national amateur radio society of Hungary, organizing contests, events, and news across shortwave, UHF, radio direction finding, and high-speed telegraphy disciplines. The site features competition announcements, a QSL bureau, licensing information from the NMHH authority, and resources for Hungarian radio amateurs at all levels.
https://azfreqcoord.org/
The Arizona Frequency Coordination Committee is the official body responsible for coordinating VHF and UHF repeater, digital, and point-to-point frequencies for amateur radio operators throughout Arizona. Run by volunteers under the Amateur Radio Council of Arizona, the site provides band plans, repeater listings, coordination policies, and application resources for ham radio operators in the region.
https://covingtoninnovations.com/astro/index.html
The companion website to Michael A. Covington's book 'Astrophotography for the Amateur,' published by Cambridge University Press, covering film astrophotography, CCD imaging, and image processing. Visitors can browse a picture gallery of Covington's own astrophotos, download free astrophotography software, and find corrections and updates to the book.
https://rckara.org/
The RCKARA (likely Reno County Kansas Amateur Radio Association) maintains this site as a hub for their amateur radio club, featuring meeting minutes, hamfest announcements, and member activities. Visitors will find detailed records of club business including repeater trustee reports, WSPR balloon tracker experiments, and links to ARRL News and NOAA Space Weather.
https://sdgares.net/
The San Diego ARES (Amateur Radio Emergency Service) section connects licensed ham radio operators in San Diego and Imperial Counties who volunteer for emergency communications during disasters and public safety events. The site provides information on joining, training resources, meeting schedules, nets, and links to the ARRL and related licensing study tools.