21st century astronomy / 
 Twenty-first century astronomy 
Jeff Hester ... [et al.]. 
 - New York :  Norton,  c2002. 
 - 1 v. (various pagings) :  col. ill. ;  28 cm. 
 - 520 .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0-393-97400-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Աստղագիտություն
<br/><br/><label>Dewey Class. No.: </label>520