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/cs/astronomerbios/a/ptolemybio.htm

Kepler, Johannes
- The son of a mercenary soldier and an innkeeper's daughter who later became a brilliant and prolific mathematician and astronomer, and creator of the Three Laws of Planetary Motion.
- http://space.about.com/cs/astronomerbios/a/keplerbio.htm

Brahe, Tycho
- Discover more about this Danish father of modern Astronomy who made precise, comprehensive astronomical measurements. His data was superior to all other measurements made until the invention of the telescope.
- http://space.about.com/cs/astronomerbios/a/tychobrahebio.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

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

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

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

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

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

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

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

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

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

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