ET stands for extraterrestrials or aliens. Since people believe that aliens are among us, some others believe that they may have existed for a long time. People want to know if the early pioneers or even those living during ancient history ever saw or mentioned aliens in their works. The Bible never makes direct reference to aliens who live on other planets, but the Bible does not deny that aliens exist.
Mostly, the Bible mentions that God made the Earth and universe. The beings that were created include humans, animals and angelic beings. Both the sun, moon and stars are mentioned as being created by God, but the planets are mentioned that they would be destroyed in the book of Revelations.