Astronomy & Space
390 sites
https://solarviews.com/eng/mars.htm
Calvin J. Hamilton's comprehensive Mars reference page covers everything from the planet's geology and atmosphere to its moons, polar regions, and exploration missions like Viking, Pathfinder, and the Mars Rovers. Packed with images, animations, 3D galleries, and scientific articles, it serves as a deep-dive educational hub for anyone fascinated by the Red Planet.
https://projectrho.com/starmap.html
Winchell Chung (aka Nyrath the nearly wise) maintains this ambitious 3-D starmap project dedicated to the golden age of science fiction and real astronomical data. Inspired by E.E. 'Doc' Smith's classic space operas, the site blends scientific accuracy with a deep love of the stars to create interactive three-dimensional maps of nearby stellar neighborhoods.
http://capella-observatory.com/
Capella Observatory documents an amateur astronomical observatory situated atop the Kupferberg in Namibia, near Windhoek, offering a rare southern-hemisphere observing perspective. The site features astrophotography and deep sky observations including nebulae, globular clusters, and open star clusters captured with a 60cm telescope.
https://umbra.nascom.nasa.gov/eclipse/980226/text/filter-sources.html
Part of NASA Reference Publication 1383, this page provides a curated list of U.S. vendors selling mylar and glass solar filters safe for eclipse and solar viewing with or without a telescope. It includes contact details for well-known optics companies like Celestron, Meade, and Orion, making it a practical companion resource for amateur astronomers preparing for solar observation.
https://1728.org/magntude.htm
A focused online calculator for computing astronomical magnitudes, covering apparent magnitude, absolute magnitude, and stellar luminosity with worked examples using real celestial objects like the Sun, Moon, and Sirius. The tool walks visitors through the underlying math of the magnitude scale, making it a handy reference for astronomy students and hobbyists alike.
https://oklo.org/
Oklo, written by Greg, is a long-running science blog that explores astrophysics, cosmology, and cutting-edge topics like interstellar objects, exoplanets, and the physics of computation. Posts blend deep technical thinking with wide-ranging curiosity, touching on thermodynamics, AI, and space science in a way that rewards careful reading.
https://starchild.gsfc.nasa.gov/docs/StarChild/StarChild.html
StarChild is NASA's Goddard Space Flight Center educational resource designed to introduce young astronomers ages 5-13 to the solar system, the Milky Way, and the broader universe. Organized into two skill levels, the site covers topics from comets and black holes to galaxies and space terminology, making complex astronomical concepts accessible to children.
http://heavens-above.com/
Heavens-Above, developed by Chris Peat, provides real-time satellite tracking and pass predictions customized to your exact location, covering the ISS, Starlink, Hubble, and hundreds of other spacecraft. Beyond satellites, the site offers interactive sky charts, solar eclipse data, comet and asteroid tracking, and deep space mission information, making it an essential tool for backyard astronomers and satellite spotters alike.
http://laughton.com/paul/rfo/rfo.html
Named in honor of Nobel Prize-winning physicist Richard Feynman, this amateur astronomy site showcases CCD astrophotography of nebulae, planets, and galaxies captured through telescopes ranging from a 4-inch Takahashi to a Celestron C11. Visitors will find detailed equipment reviews, imaging guides, comet and planet sequences, and a rich gallery of deep-sky objects including the Horsehead Nebula, M42, and Hale-Bopp.
https://openphdguiding.org/phd2-log-viewer
PHD2 Guiding is the home of PHD2, a free and open-source autoguiding software used by astrophotographers to keep telescopes precisely locked on celestial targets. This page highlights a log file viewer tool developed by Andy Galasso, which helps users visualize guiding performance and diagnose tracking issues from their PHD2 guide logs.