Astronomy & Space
396 sites
https://astrosystems.biz/
AstroSystems is a Colorado-based manufacturer selling telescope kits, accessories, and components including their signature TeleKit truss tube Dobsonians, secondary mirrors, laser collimators, and digital setting circles. With worldwide shipping and a broad catalog spanning fast f/ratio optics to dew removal systems, this site is a go-to resource for amateur telescope makers and Dobsonian enthusiasts.
https://trivalleystargazers.org/
The Tri-Valley Stargazers is an amateur astronomy club based in Livermore, California, serving the east San Francisco Bay Area with star parties, observing programs, loaner telescopes, and monthly public meetings featuring guest speakers. The site covers club membership benefits, viewing site details, upcoming events, and resources for hobbyist astronomers at all levels.
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.
http://allthesky.com/
Created by Till Credner and Sven Kohle, AllTheSky.com is a stunning astrophotography gallery spanning comets, nebulae, galaxies, constellations, aurora borealis, and atmospheric phenomena. The site offers an impressive breadth of celestial imagery including nightscapes, 360-degree views, live all-sky feeds, and articles that make it a rich destination for astronomy enthusiasts.
http://phy6.org/stargaze/Sintro.htm
Created by Dr. David P. Stern, 'From Stargazers to Starships' is a comprehensive web-based textbook covering astronomy, Newtonian mechanics, the Sun, and spaceflight at a high school level. The site includes glossaries, timelines, Q&A sections, lesson plans, and supplementary materials for educators, making it a rich self-contained learning resource with a strong historical perspective.
https://atmob.org/
The Amateur Telescope Makers of Boston (ATMoB) is a 501(c)3 nonprofit astronomy club that meets monthly at the Harvard-Smithsonian Center for Astrophysics, welcoming the public to join in observing, telescope making, and outreach events. The site offers club history, star party schedules, a clubhouse sky-conditions monitor, photo albums, and resources for getting started in amateur astronomy.
http://astrophysical.org/
Astrophysical.org is a scientific popularization site run by Istituto Scientia, covering astrophysics and astronomy with sections on stars, magnitude, an online planetarium, and the SAO star catalog. Visitors can explore topics from stellar spectral classification to cosmology, with links to companion site Astrometry.org for celestial mechanics content.
https://sbau.org/default.html
The Santa Barbara Astronomical Unit (SBAU) is an active astronomy club based in Santa Barbara, California, hosting monthly public meetings featuring talks by prominent researchers from NASA, JPL, and leading universities. The site offers event calendars, dark sky site listings, equipment for sale, newsletters, and a rich archive of past speaker videos dating back to 2008.
http://maps.seds.org/Const/const_family.html
Hosted on the SEDS (Students for the Exploration and Development of Space) server, this reference page catalogs the traditional constellation families of the night sky, grouping constellations like the Ursa Major family, the Zodiac, and the La Caille southern sky instruments. Each constellation entry links to deeper information, making it a useful guide for amateur stargazers learning to navigate the celestial sphere.
http://rvasclub.org/
The Roanoke Valley Astronomical Society (RVAS) is a Virginia-based astronomy club offering monthly meetings, observing sessions, newsletters, and astrophotography resources for members. The site includes clear sky charts, a DSO of the month feature, member pages, and meeting announcements with guest speakers covering topics like astrophotography techniques.