The Great Filter theory suggests that our lack of contact with extraterrestrial civilizations may arise from either their ...

Explore 9 cosmic mysteries, from galaxy formation to dark energy, the Big Bang, and life beyond Earth. Discover the ...

Plate tectonics is a theory that explains how Earth’s lithosphere ... This is referred to as the Fermi Paradox, as suggested in 1950 by Nobel Prize-winning physicist Enrico Fermi.