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://nineplanets.org/amateur-astronomical-observatories
The Nine Planets hosts a curated list of amateur astronomical observatories built by individual hobbyists, compiled by the site owner during research for their own backyard observatory project. Visitors will find practical inspiration and design ideas ranging from simple roll-off roof builds to more complex dome structures, all set within a broader astronomy reference site covering planets, stars, comets, and equipment guides.
https://homepages.abdn.ac.uk/nph120/astro/astlinks.html
Assembled by John S. Reid at the University of Aberdeen, this curated astronomy links page was built to support a Level 1 Astronomy class, covering general astronomy, the solar system, space missions, and observatories. With over 200 links organized into clear sections, it points students to tools like Stellarium, NASA catalogues, online textbooks, and the European Space Agency.
https://www.qsl.net/zl1vk
The Papakura Radio Club (ZL1VK), founded in 1960 and based in South Auckland, New Zealand, serves local amateur radio operators through club meetings, radio nets, technical projects, and emergency communications (AREC). The site includes club history, a newsletter, member pages, contest participation details, and hands-on projects covering APRS, microprocessors, antenna builds, and equipment modifications.
https://www.hobbyprojects.com/useful_site_links.html
HobbyProjects.com curates an extensive collection of links to electronics tutorials, circuits, engineering projects, and useful resources for hobbyists at all skill levels. The site also offers its own tutorials covering topics from basic electronics to microcontrollers, along with dictionaries, formulas, and reference materials for electronics enthusiasts.
https://panspermia.org/
Cosmic Ancestry is a deep-dive scientific resource exploring the theory of panspermia, arguing that life on Earth originated from space and that all evolutionary innovation depends on genetic material of cosmic origin. The site covers astrobiology, comets as delivery systems, interstellar dust, the work of Fred Hoyle and Chandra Wickramasinghe, and presents extensive evidence comparing Darwinism with the Cosmic Ancestry hypothesis.
https://rochesterskies.org/
The Rochester Astronomy Club is a 501(c)(3) non-profit based in Rochester, Minnesota, offering public night sky viewing events, member resources, and a club forum for amateur astronomers. The site features observing reports, event calendars, member blogs covering topics like Titan shadow transits and comet sightings, and outreach activities at local community events.
http://cvafresno.org/
The Central Valley Astronomers is an amateur astronomy club based in Fresno, California, welcoming everyone from beginners to seasoned professionals with star parties, astrophotography, and educational meetings. The site includes a club calendar, membership info, a Young Astronomer Program, star party etiquette guides, light pollution resources, and tips on purchasing equipment.
https://amateurfunk.de/
Jürgen Mayer (DL8MA) maintains this German amateur radio page covering emergency communications, AREDN mesh networking, LoRa/LoRaWAN IoT, and QO-100 satellite operations. The site also connects to the Notfunkreferat for the Württemberg district, making it a hub for regional ham radio emergency preparedness.
https://qsl.net/w4sat/antenna.htm
Antenna Elmer is a comprehensive ham radio antenna reference covering dipoles, folded dipoles, ground planes, beams, and vertical antennas for HF, VHF, and UHF frequencies. Visitors can design their own antennas using calculators and conversion tools, with guides covering coax efficiency, frequency scaling, and even a creative 'fan-tenna' built from a household fan.
http://crystalinks.com/precession.html
Crystalinks explores the precession of the equinoxes and the Age of Aquarius, weaving together astronomy, ancient civilizations, and esoteric symbolism into a single reference page. Visitors will find discussions of the North Pole Star Thuban, the Great Sphinx, Draco constellation, Milankovitch cycles, and the significance of sidereal years across ancient cultures.