 
  Extragalactic 
radio sources   
 (continued)
The jets: 
 
  
  
    | 
         
      1977 
        
         
      1978 
        
        
      1979 
        
        
       1980
  | 
    
        
  |  
  
    Fig. 1:
	On the right, the radio jet of  3C273  
	observed with 
	
    MERLIN  at 400 MHz.  Osservations VLBI  
      	observations (on the left) have shown that in the innermost part of the 
	jet there are regions which move away from the nucleus at a speed close to 
	that of light.  The images show radio data observed at four different
	times.  
    (Credits: MERLIN) |    
 
  
  
      | 
    Fig. 2:
	The radio jet of NGC6251  
    
	
	which is 300,000
	
	light years long.  
    (Credits: 
	The Astronomical Society of Pacific). |    
  
 
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