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://astrotulsa.com/
The Astronomy Club of Tulsa is a non-profit organization that has been bringing astronomy to Oklahoma residents since 1937, operating its own observatory southwest of Tulsa near Mounds and hosting regular public stargazing events. Visitors can find event schedules, monthly newsletters, sky maps, and resources for both beginners and experienced astronomers.
http://n0hr.com/
N0HR.com is a hub for amateur radio operators, offering PocketPC ham radio software including MobileLog 2 for contact logging, PPCMorse for learning Morse code, and PocketDigi for digital modes like PSK31 and RTTY. The site also features a large curated and user-rated ham radio links directory, HF propagation tools, a DXPedition map, and a blog covering tower projects, contests, and DX activity.
https://mathshistory.st-andrews.ac.uk/
MacTutor is a vast free archive maintained by mathematicians Edmund Robertson and John O'Connor of the University of St Andrews, featuring biographies of over 3000 mathematicians and more than 2000 historical essays. A true labor of love recognized with the Hirst Prize of the London Mathematical Society, it includes specialized indexes covering female mathematicians, mathematical societies, historical curves, and even postage stamps honoring math figures.
https://geo.mtu.edu/volcanoes
Hosted at Michigan Tech since 1993, this long-running volcano resource page gathers links to educational tools, research sites, webcams, and cultural materials related to volcanology from around the world. Visitors can explore active volcano feeds, teaching resources, folklore, myths, and interviews with real volcanologists, making it a rich hub for both students and enthusiasts.
https://hamfest.org/
The Huntsville Hamfest is one of the longest-running amateur radio events in the United States, held annually since 1954 at the Von Braun Center in Huntsville, Alabama. In 2026 it will host the ARRL National Convention, featuring a dealer show, flea market, forums, licensing opportunities, and activities for the whole family.
http://burtleburtle.net/bob/scifi/dyson.html
Bob's detailed technical exploration of Dyson swarms and torus-shaped satellite constellations covers the mathematics and orbital mechanics behind capturing a star's energy output. The page features interactive JavaScript simulations letting visitors visualize these megastructure concepts from within the swarm itself, alongside references to real-world applications like SpaceX's Starlink constellation.
http://rocketroberts.com/astro/astrophot.htm
Joe Roberts shares a remarkable personal archive of amateur astrophotography spanning from 1974 to 2013, featuring backyard telescope images of deep-sky objects, planets, comets, and lunar phenomena. The site includes technical articles, a tour of his personal observatory, and a gallery of stunning images that rival professional observatory photography from decades past.
https://mathgenealogy.org/
The Mathematics Genealogy Project is a massive academic database tracking the doctoral advisor lineages of mathematicians worldwide, with over 337,000 records linking students to their advisors across generations. Hosted by NDSU in association with the American Mathematical Society, it lets you trace the intellectual ancestry of virtually any mathematician back through history.
https://amsmeteors.org/meteor-showers/meteor-shower-calendar?y=2022
The American Meteor Society, founded in 1911, maintains this comprehensive resource for tracking meteor showers, fireballs, and related meteoric phenomena, including a detailed calendar of upcoming showers for 2026-2027. Visitors can report fireball sightings, browse fireball logs, explore observing programs, and access guides on photographing meteors with a DSLR.
http://lists.contesting.com/_3830
The 3830 mailing list archives preserve decades of amateur radio contesting discussion, spanning from 1996 through 2023. Operators and contesters can browse monthly threads or search the full archive to find score postings, contest strategies, and community conversation going back nearly 30 years.