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://zl2pd.com/index.html
Andrew Woodfield (ZL2PD) has built an extensive technical resource covering homebrew QRP transceivers, Si5351 VFO/BFO projects, antenna tuners, and DIY electronics for amateur radio operators. The site spans decades of original projects with detailed build guides, circuit diagrams, and modification instructions for portable HF SSB gear.
http://www.dmx512.com/
DMX512.com is a technical reference hub dedicated to entertainment technology, covering stage lighting, audio, communications, MIDI, show control, and power systems for theatre production. Named after the DMX512 lighting control protocol, the site organizes resources across multiple categories including net resources, reference materials, and even accident reports relevant to technical theatre professionals.
https://fcrosby.com/ears
A historical archive of the Englewood Amateur Radio Society, preserving records and activities from 1999 to 2017. The site serves as a digital repository for this local ham radio club's legacy, offering a rare glimpse into nearly two decades of amateur radio community organizing.
http://marcmvra.net/
The Mankato Area Radio Club (MARC) has served amateur radio operators in southern Minnesota since 1954, and this official site provides meeting details, repeater frequencies, local net schedules, and VE testing information. A great resource for hams in the Mankato region looking to connect with a local club or find area frequency programming.
http://panoptesv.com/SciFi/ColorsOfAlienWorlds/AlienFields.php
A scientifically grounded resource that predicts the colors of photosynthesizing plants on alien worlds, modeling how different star types and atmospheric pressures would shape the evolution of plant pigmentation. Featuring nearly 100 generated color swatches across spectral classes from A0 to M8, it draws on real peer-reviewed research to help worldbuilders, astrobiologists, and science enthusiasts imagine life beyond Earth.
https://www.qsl.net/dearg
The Driven Elements Amateur Radio Group (DEARG) is a Northeast Arkansas ham radio club operating under call sign KD5PXG, focused on 6 and 2 meter single sideband operation on 144.220 USB. The site serves as the club's web presence with sections for membership info, archives, and Sporadic E propagation news.
https://cometchasing.skyhound.com/
Comet Chasing, maintained by Skyhound, provides monthly up-to-date observing guides for telescopic comets visible this month, complete with finder charts, observing synopses, and brightness predictions tailored to your latitude and equipment. It covers current comets like Kreutz sungrazers and PANSTARRS discoveries, making it an invaluable tool for amateur astronomers who want to hunt comets visually or through imaging.
http://curiousskywatcher.blogspot.com/
The Curious Skywatcher is a dedicated astronomy blog offering monthly celestial highlights, including planet positions, meteor showers, and sky-watching tips for amateur stargazers. Posts guide readers on locating stars and planets with the naked eye, making it a friendly and practical resource for anyone wanting to explore the night sky.
https://spacewatch.lpl.arizona.edu/fmo-project/overview
The SPACEWATCH® FMO Project, run by the University of Arizona's Lunar and Planetary Laboratory, documents the detection of Fast Moving Objects, which are near-Earth asteroids passing so close that they appear as light trails in telescope imagery. The site explains the science behind close-approach asteroid detection, shares discovery images, and describes the citizen participation program that once helped identify faint FMOs.
http://ned.ipac.caltech.edu/help/cosmology_calc.html
Hosted by NASA's Extragalactic Database (NED) at Caltech, this curated page collects links to online cosmology calculators contributed by researchers at UCLA, University of Colorado, and other institutions. Visitors can compute distances, lookback times, Hubble parameters, K-corrections, and other key cosmological quantities by entering values like redshift, Hubble constant, and Omega parameters.