Aliens, also known as extraterrestrial life, refer to intelligent or non intelligent life forms outside of Earth. Human imagination of them transcends cultures: from the "extraterrestrial visitors" in ancient literature to the alien or high-dimensional beings in modern science fiction works.

The scientific community uses radio telescopes (such asSETIThe plan is to continuously monitor signals from the universe and search for traces of microorganisms within the solar system, such as Mars and Europa. The Fermi paradox sharply asks, "If the universe is full of life, why can't we see evidence

No matter what the future holds, the exploration of extraterrestrial life always reflects humanity's ultimate contemplation on its own origins, loneliness, and existence.