Ένας λαός με αξίες. Science Illustrated GR. Όμιλος Φίλων Αστρονομίας. Australian Geographic – the best images and stories about Australia - Journal, Society, Outdoor magazine, Education - geography, photography, wildlife, adventure and science - Australian Geographic. Greece / ESA in your country / ESA. Views of the Solar System.
Photojournal: NASA's Image Access Home Page. Great Discoveries Channel: Sci, Space, Tech. ΕΛ.ΑΣ.ΕΤ. - Αρχική Σελίδα. Ο Νίκος Λυγερός στις "Αντιθέσεις"