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Galaxy - Wikipedia
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally "milky", a reference to the Milky Way.Galaxies range in size from dwarfs with just a few hundred million (10 8) stars to giants with one hundred trillion (10 14) stars, each orbiting its galaxy's center ...
HubbleSite - Out of the ordinary...out of this world.
Identify constellations, planets, deep-sky objects and more with our monthly guide to the heavens.
Kitt Peak National Observatory Visitor Center
Nighttime Programs. View objects of the cosmos through Visitor Center telescopes! See planets, nebulae, galaxies, star nurseries, and more.
List of nearest galaxies - Wikipedia
List of galaxies; List of nearest stars and brown dwarfs; List of spiral galaxies; Notes
Stars and Galaxies - NASA Jet Propulsion Laboratory
The home of Universe-related news, features, images and mission information about stars, galaxies and exoplanets studied by NASA's Jet Propulsion Laboratory
How Many Galaxies Are There in the Universe? The Redder We ...
A trillion galaxies in the observable universe, and if you had $16 for each one, you could pay off the US National Debt.
Arp's Catalog Of Peculiar Galaxies
Comprehensive exploration of the galaxies involved in Halton C. Arp's Atlas of Peculiar Galaxies, to support the astronomical observer.
Smartphones: Full Line of Galaxy Smartphones | Samsung UK
Discover Samsung's full range of smartphones. From the Galaxy S8 to the simply smart Galaxy J Series, everything you need to know to choose your smartphone.
Home | STScI
We envision, define, and operate missions that offer cutting-edge research opportunities for the astronomical community.
Zoom Astronomy Glossary: G - Welcome to Enchanted Learning!
Astronomy glossary explains basic astronomical terms, G. GALILEAN MOONS The Galilean moons are the four largest moons of Jupiter.These moons, Ganymede, Io, Callisto, and Europa, were discovered by Galileo in 1610; Galileo was using his 20-power telescope.