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://hflink.com/
HFLINK is the international hub for ALE (Automatic Link Establishment) high-frequency ham radio communications, covering HF interoperability, selective calling (SELCALL), and emergency communications. Visitors can find ALE frequencies, band guides, software resources, propagation data, and archives from HF interoperability exercises dating back years.
https://iceinspace.com.au/
IceInSpace is the largest online amateur astronomy community in the Southern Hemisphere, serving over 20,000 registered members across Australia, New Zealand, and South America. The site features astronomy forums, equipment reviews, DIY projects, astrophotography galleries, event reports, and an astronomy glossary tailored to southern hemisphere observers.
http://sacmarc.org/
SACMARC is an amateur radio club based in Bellevue, Nebraska, operating under the callsigns K0AIR and K0GRL. The site serves as the online presence for this local ham radio organization, with a history spanning from 1997 to 2022.
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.
https://hamqsl.com/
Paul Herrman (N0NBH) built this comprehensive resource for ham radio operators tracking HF propagation conditions, offering free solar-terrestrial data widgets, banners, and tools that can be embedded in any website. Visitors will find online calculators for SFI/SN conversion, K-Index to signal noise, Aurora latitude tools, MUF/LOF prediction maps, and live solar flux and sunspot data updated every few hours.
https://planetary.chem.tufts.edu/Phoenix/index.html
A page dedicated to NASA's Phoenix Mars Scout Mission, hosted on a Tufts University chemistry server, featuring launch videos including a close-up NASA recording and a team footage from Cocoa Beach in August 2007. It offers a glimpse into the excitement surrounding the Phoenix lander's launch, which went on to study the Martian arctic soil.
https://fedastro.org.uk/
The Federation of Astronomical Societies is a UK-based umbrella organization connecting amateur astronomy clubs and societies across Britain. It serves as a hub for coordinating events, sharing resources, and supporting the broader community of stargazers and astronomical enthusiasts in the region.
https://math.ucr.edu/home/baez
John Baez is a mathematical physicist and emeritus professor at UC Riverside whose sprawling personal site features decades of expository writing on math and physics, including his long-running column 'This Week's Finds in Mathematical Physics.' Visitors can explore course notes, research papers, talks on topics from category theory to the Standard Model, and accessible blog posts bridging cutting-edge science with public engagement.
http://solstation.com/life.htm
SolStation.com hosts detailed information about nearby star systems and the search for extraterrestrial life, making it a rich reference for amateur astronomers and space enthusiasts. The site explores the habitability of star systems within our cosmic neighborhood, combining scientific data with accessible writing.
https://math.cowpi.com/
Math @ CowPi offers a curated collection of math tools and resources, including interactive GeoGebra sketches, a system-of-equations solver for up to five unknowns, and a full annotated text of Edwin A. Abbott's classic novel Flatland. Visitors will also find organized math links spanning algebra, geometry, trigonometry, and calculus, making it a handy reference for students and enthusiasts alike.