![Image](http://membres.lycos.fr/tompouce00/images/HelixBuild1.jpg)
![Image](http://membres.lycos.fr/tompouce00/images/ngc7293-celestia.jpg)
In fact, radius in Celestia is not the same that the nebula one's, it is the size of the model. So radius depend on how the texture is mapped to the models. Those dimension should only be used to give a magnitude order.
The error message that I get (en Francais) is that I must first visit the home page in order to access the zip file. After a few seconds, the error page loads the Web page http://membres.lycos.fr/tompouce00/, accompanied by a popup advertisement.
This is reasonable for a free web site, but annoying.