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)
http://hfpower.com/
ACOM is a manufacturer of HF linear amplifiers and related amateur radio equipment, including the flagship ACOM 2000A automatic amplifier and the ACOM 1000A. The site serves as a product hub for serious ham radio operators seeking high-power amplification solutions built around tubes like the Svetlana 4CX800A.
http://k3pgp.org/
K3PGP's Experimenter's Corner is a wide-ranging amateur radio and electronics hobbyist site covering everything from VLF to light, including moonbounce (EME), lasers, antenna construction, and weak signal work. Run by the operator K3PGP, the site spans decades of experimentation and also touches on astronomy, bicycle construction, and software.
https://skyhound.com/sh/dso_guide.html
Skyhound's Guide to Deep Sky Objects is a comprehensive reference covering every major category of deep sky objects, from open star clusters and globular clusters to quasars and gravitational lenses. Each section explains what the objects are, how they appear through a telescope, and highlights notable examples like the Veil Nebula, Einstein's Cross, and the Pleiades.
http://amurbirding.blogspot.com/
The Amur Bird Project documents bird research and conservation efforts in Russia's Amur region and Siberia, with detailed field reports on catching, tagging, and tracking species like Bluethroats with geolocators. Run by a team of researchers including Wieland Heim and collaborators, it offers a rare window into ornithological fieldwork in some of the world's most remote wetland habitats.
http://smallwonderqrp.blogspot.com/2019/04/fiero-compact-qrp-ssbcw-transceiver.html
K.P.S. Kang's blog dedicated to QRP (low power) radio transceiver design, featuring detailed technical write-ups on homebrew SSB/CW transceivers like the FIREO, which uses an innovative FM limiter circuit for speech compression. A must-read for ham radio enthusiasts interested in minimalist radio construction and RF engineering theory.
https://ure.es/
The Unión de Radioaficionados Españoles (URE) is Spain's national amateur radio association and the Spanish section of the IARU, serving as the official body representing ham radio operators across the country. The site offers licensing information, exam guidance, contest calendars, QSL traffic resources, a webcluster, a members-only area, and a regularly published magazine called Radioaficionados.
http://nefariousplots.com/figures/4
An interactive data visualization called 'The Population of Space' charts every human spaceflight from Yuri Gagarin in 1961 through 2014, grouping missions by launch vehicle and coloring them by historical era. Created in honor of the 45th anniversary of Apollo 11, it offers a fascinating way to explore how long humans have spent in space, which nations sent them, and how the shift from Soviet stations to the International Space Station shaped our continuous presence off-world.
https://www.qsl.net/smcara/club_members.html
The St. Mary's County Amateur Radio Association (SMCARA) has been supporting amateur radio operators in southern Maryland since 1956, and this page presents their full club membership roster with call signs, license classes, and ARRL/volunteer examiner status. With 62 members listed and resources for becoming a ham radio operator, the site offers a solid look at an active regional ham radio club.
https://deepimpact.astro.umd.edu/
The official University of Maryland archive for NASA's Deep Impact mission, which sent a spacecraft to collide with comet Tempel 1 in 2005 and later extended its mission as EPOXI to observe comet Hartley 2 and distant exoplanets. The site preserves science results, image and video galleries, team member profiles, and mission history through the spacecraft's final loss of contact in 2013.
http://nsminerals.atspace.com/
Created by Ronnie Van Dommelen, this site is a dedicated reference guide to the mineralogy of Nova Scotia, Canada, covering locality information, mineral images, species studies, and reported minerals from the region. It highlights the province's world-class zeolites, Bay of Fundy collecting sites, and serves as an online resource for mineral enthusiasts and collectors worldwide.