ASTRONOMY AND ASTROPHYSICS: 
 
   
 
 
 
 
     
 
 
 
 
 
     
 
 
 
 
 
     
 
     
 
     
 
 
 
 
 
 
     
 
 
 
See also History of Astronomy
and History of Astrophysics
  
  
  
  
  
  
	
  
  
  
  
  
  
  
  
THE NET ADVANCE OF PHYSICS