Galaxy Page
Hot topics, real-time data, tours of the solar system, and aerospace and astronautics resources and links. 
Messier Objects By Type
Images and vital statistics for Messier deep space objects, nebulae, galaxies, and clusters. 
The Hubble Sequence of Galaxies
Follow George Lake, of the University of Washington, as he presents theories for the diversity of galaxy formations. 
Space Telescope Science Institute Home Page
Fireworks of Star Formation Light Up a Galaxy About HST & NGST About ST ScI Pictures & News Releases Education Activities HST Observing & Instruments HST & Multimission Data Archive Science Resources New and Notable: April Symposium, A Decade of... 
Stars and Galaxies
The Stars and Galaxies Web site aims to gives visitors an idea of how stars behave, generate energy and die. It includes photos, data and descriptions of the various states of stars. 
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 
NASA/ IPAC Extragalactic Database (NED)
A searchable database of celestial objects found outside our galaxy. Features the names, positions, images, abstracts, and related data for extragalactic entities, with tools for data conversion and plotting. 
Galaxy Imaging Home Page
Welcome To the Home Page of 3D Animation and Visual Effects Service Galaxy Imaging (originally named "Galaxy Video & Animations") was founded in 1991 by Joe Dox and Scott Wheeler. 
Galaxy Catalog
Princeton University's Department of Astrophysics catalogs images from 113 nearby galaxies at this site.
Astronomy Hypertextbook
This site is a "hypertextbook" designed to teach college level astronomy. Here the student can find lessons on the nature of galaxies, planetary geophysics and more 
Active Galaxies
Monthly newsletter is dedicated to the observation and theory of active galaxies. Features papers, conference info, and job listings. 
NASA Observatorium
NASA presents astronomy and spaceflight images, video, explanations, trivia and other games to the general public, kids and educators. Includes teacher's guides and related educational resources. 
APOD Glossary
Astronomy Picture of the Day Glossary Cepheid: A pulsating variable star. This type of star undergoes a rhythmic pulsation as indicated by its regular pattern of changing brightness as a function of time. 
Discover the Universe
Overview and basic information about astronomy and the Universe.