Links
Live NASA Web "TV" ! Shuttle Missions and more!
S.E.D.S. NGC and Messier Search! Try it!
Swinburne University of Technology Astronomy Online
Sources for MessierMarathon.com include:
The www.seds.org database, a massive amount of information has been compiled here!
Many photos from HTTP://WWW.AAO.GOV.AU/images.html
More quality photo's from http://oposite.stsci.edu/pubinfo/pictures.html
"Astronomy" magazine www.astronomy.com
"Sky and Telescope" magazine www.skypub.com
"SkyAtlas 2000" www.skypub.com
"The Messier objects" by Stephen James O'Meara by www.skypub.com
"Home Planet" by John Walker www.fourmilab.ch
"The Ultimate Messier object log" by David Paul Green www.davidpaulgreen.com
"Greenwich Observatory 300 years of astronomy" edited by Colin A Ronan
"Redshift 3" Astronomy software