www.nasa.gov

www.spaceflights.nasa.gov

www.hq.nasa.gov/office/pao/History/timeline.html

http://seds.lpl.arizona.edu/nineplanets/nineplanets/nineplanets.html#toc

http://www.fourmilab.ch/solar/solar.html

http://www.hawastsoc.org/solar/eng/homepage.htm

http://space.jpl.nasa.gov/

The Pictorial History of NASA

Focus

Specchio

Il Guinness dell' Astronomia

by Bill Yenne - 1989

( italian science magazine )  N.81 - 1999 July

( italian magazine )   N.172 - 1999 May

by Patrick Moore - 1990