http://voltaire.csun.edu/roland/ngc7662.html
http://voltaire.csun.edu/roland/ngc6543.html
http://voltaire.csun.edu/roland/ngc6905.html
http://voltaire.csun.edu/roland/ngc6818.html
http://voltaire.csun.edu/roland/egg.html
http://voltaire.csun.edu/roland/cross.html
http://voltaire.csun.edu/roland/uranus.html
글과 그림의 목차는
http://voltaire.csun.edu/roland/index.html
ST-2000XM으로 찍은 M20도 훌륭합니다.
http://voltaire.csun.edu/roland/m20a.html
M15내의 행성상 성운 Pease 1 도 잘 나왔고...
http://voltaire.csun.edu/roland/m15.html