Should this change the way we live? Evidence that humans might not be alone in the universe inspires a mix of excitement, fear and hope for the future.
Life on distant planet 99.7% certain
Faraway world: The image shows an artist’s impression of K2-18b orbiting the tiny red dwarf star K2-18. The giant exoplanet is about 120 light-years away from Earth. To get there in a modern rocket would take over two million years! Glossary
ET - ET stands for Extra-Terrestrial, meaning from beyond Earth. It is the name of a 1982 film about a boy who befriends an alien.
SETI Institute - A not-for-profit research organisation established in 1984 with the mission is to explore, understand, and explain the origin and nature of life in the universe.