[ah] Rony you need to read Larry Niven's Ringworld. Here's a primer: http://www.rahul.net/rootbear/graphics/ringworld/rw0a.html
[ah] Huda, lets not be too quick here :). A small study of the physics involved will tell you that the idea is impractical.
[ah] Hmmm, on second thoughts, are you thinking of something in the satellite scale?
Regards,
ah