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http://el.wikipedia.org/wiki/ http://www.astrovox.gr/satellites.html http://lyk-n-moudan.chal.sch.gr/Downloads/Yliko/doryforoi.pdf http://astroforum.gr/forum/viewtopic.php?t=1689 http://www.livepedia.gr/index.php/ http://gym-astyp.dod.sch.gr/sputnik/sputnik/INFORMATION%20.htm http://www.e-telescope.gr/el/astronomy-and-space/61-first-greek-sattelite http://lyk-vatheos.eyv.sch.gr http://www.tovima.gr/science/article/?aid=358352 http://digitalschool.minedu.gov.gr/modules/ebook/show.php/DSGL-B110/93/7372760/

http://users.uom.gr/~perdos/Yliko/ch_3.pdf http://www.gma.org/surfing/sats.html http://science.howstuffworks.com/satellite1.htm

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