Ptolemy  
   An astronomer, mathematician and geographer who lived in Alexandria, Egypt. We know very little more of his life. He classified the Greek geocentric view of the universe, and calculated the apparent motions of the planets.
   http://space.about.com/library/weekly/aa103102a.htm

Kepler, Johannes  
   German astronomer Johannes Kepler was a supporter of the Copernican model of the universe. Find out more about his life and work.
   http://sirius.phy.hr/~dpaar/fizicari/xkepler.html

Halley, Edmond  
   Sir Edmond Halley did more than calculate the return of the comet named after him. Learn more about his work with the motion of stars, and his study of Mercury and Venus.
   http://sirius.phy.hr/~dpaar/fizicari/xhalley.html

Herschel, Caroline  
   A short biography of the first woman to discover a comet.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/herschel.html

Hubble, Edwin  
   A biography of a man who expanded our view of the universe.
   http://www.pbs.org/wnet/hawking/cosmostar/html/cstars_hubble.html

Adams, John Couch  
   The first to mathematically predict an unknown planet, his calculations were ignored and someone else discovered Neptune.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/adams.html

Bell Burnel, Jocelyn  
   The radio astronomer who discovered what turned out to be neutron stars, also called pulsars.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/bell.html

Chandrasekhar, Subrahmanyan  
   The man whose name means "shining" in Sanskrit figured out exactly what makes stars shine.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/chandra.html

Le Verrier, Urbain  
   The French astronomer whose mathematical predictions led to the discovery of Neptune.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/leverrier.html

Tombaugh, Clyde  
   The discoverer of Pluto started out as an amateur who built his own telescopes.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/tombaugh.html

StarChild: Dr. Carl Sagan  
   Tells about the science who sought to make the universe clearer to the ordinary person.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/sagan.html

Famous Astronomers  
   Features profiles of various astronomers of fame, from Galileo to Ptolemy.
   http://library.thinkquest.org/23830/astronomers.htm

StarChild: Dr. Stephen Hawking  
   Tells about the physicist known for his study of black holes.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/hawking.html

Brahe, Tycho  
   Danish astronomer who did the most accurate measurements of the sky ever made without a telescope.
   http://starchild.gsfc.nasa.gov/docs/StarChild/whos_who_level2/brahe.html