Look up: Sa galaxy

1. 
   Sa galaxy
   (from the article `galaxy`) These normal spirals have narrow, tightly wound arms, which usually are visible because of the presence of interstellar dust and, in many cases, ...
   Found on http://www.britannica.com/eb/a-z/s/1
   
   
2. 
   Sagittarius Dwarf Elliptical Galaxy
   The `Sagittarius Dwarf Elliptical Galaxy` (`SagDEG`) is an elliptically looped shaped satellite galaxy of the Milky Way Galaxy. The main cluster which, in 1994, was the first to be discovered, is roughly 10,000 light-years in diameter, and is currently about 70,000 light-years from Earth and traveling in a polar orbit at a distance of about 50,000 light-years from the core of the Milky Way (about 1/3 the distance of the Large Magellanic Cloud). S...
   Found on http://en.wikipedia.org/wiki/Sagittarius
   
   
3. 
   Sagittarius Dwarf Irregular Galaxy
   The `Sagittarius Dwarf Irregular Galaxy` or `SagDIG` is a dwarf galaxy in the constellation of Sagittarius. It lies 4.2 million light-years away. SagDIG should not be confused with the Sagittarius Dwarf Elliptical Galaxy or SagDEG, a satellite galaxy of the Milky Way. It was discovered by Cesarsky et al. on a photographic plate taken for the ESO (B) Atlas on June 13 1977 using the ESO 1 meter Schmidt telescope.
   Found on http://en.wikipedia.org/wiki/Sagittarius
   
   
4. 
   Sagittarius Dwarf Elliptical Galaxy
   (SagDEG, Sag dSph) A satellite galaxy of the Milky Way and the second closest external galaxy after the Canis Major Dwarf. It is populated, as is usual for a dwarf elliptical galaxy, by old yellowish stars. Obscured by large amounts of dust in the galactic plane, SagDEG was...
   Found on http://www.daviddarling.info/encyclopedi
   
   
5. 
   Sagittarius Dwarf Irregular Galaxy
   (SagDIG, Sag dIrr) A dwarf irregular galaxy, discovered in 1977, that is a member of the Local Group of galaxies. It has a diameter of about 3,000 light-years and lies about 3,500 light-years away in the constellation Sagittarius at celestial coordinates R.A. 19h 30m, Dec. ...
   Found on http://www.daviddarling.info/encyclopedi
   
   
6. 
   Satellite galaxy
   A `satellite galaxy` orbits a larger galaxy, due to gravitational attraction. Though a galaxy is made of a large number of objects (such as stars, planets, and nebulae) which are not connected to each other, it has a center of mass, which represents a weighted average (by mass) of the positions of each component object. This is similar to how an everyday object has a center of mass which is the weighted average of the positions of all its compone...
   Found on http://en.wikipedia.org/wiki/Satellite_g
   
   
7. 
   satellite galaxy
   A small galaxy – typically an irregular or dwarf system – in orbit around a much larger, more massive one. Our own Galaxy, for example, has several satellite galaxies, including the Large and Small Magellanic Clouds.
   Found on http://www.daviddarling.info/encyclopedi