It’s Possible Alien Civilizations Have Explored the Milky Way, Visited Earth Millions of Years Ago: Study

This undated handout artist concept provided by Harvard Smithsonian Center for Astrophysics shows the newly discovered planets named Kepler-62e and -f. AP Photo/Harvard Smithsonian Center for Astrophysics

Aliens or non-human civilized life within our own Milky Way could have already visited Earth but we just aren’t aware of it, a new study says.

The study, published Aug. 20 in The Astronomical Journal, examines the Fermi Paradox and suggests that it’s possible that alien civilizations have visited Earth but that it was so long ago, we weren’t around to see it. The study set out to examine the Fermi Paradox, which questions why we haven’t been able to detect signs of alien life.