Extraterrestrial life, or alien life (colloquially, aliens), is life that originates from another world rather than on Earth. No extraterrestrial life has yet been scientifically conclusively detected.

6 days ago · Extraterrestrial life refers to life that may exist or may have existed in the universe outside of Earth. The search for extraterrestrial life encompasses many fundamental scientific questions, including ‘What are the basic requirements …

3 days ago · A study suggesting the exoplanet K2-18b shows potential signs of alien life has been met with skepticism from the scientific community. Here’s the truth about what the James Webb Space Telescope ...

Apr 21, 2025 · The search for extraterrestrial life is sprinkled with tantalizing hints that have often ultimately turned out to have non-biological explanations. For instance, ...

6 days ago · Extraterrestrial life - Exoplanets, Habitability, Astrobiology: For thousands of years humans have wondered whether they were alone in the universe or whether other worlds populated by more or less humanlike creatures might exist.

Apr 17, 2025 · Astronomers announced Thursday that they had detected the most promising "hints" of potential life on a planet beyond our Solar System, though other scientists expressed scepticism. There has been vigorous debate in scientific circles about whether the planet K2-18b, which is 124 light years away in ...

Apr 3, 2025 · Four small, newly discovered worlds are less than six light-years away from Earth, and their discovery reinforces a cautionary tale from planet hunting’s prehistory. The intriguing chemistry of a...

Apr 17, 2025 · According to astrobiologists, discovering a Hycean planet would represent one of the best opportunities to find extraterrestrial life. This is not the first time that K2-18b has caught the ...

Apr 20, 2025 · The search for extraterrestrial life is most clearly grasped by imagining the reverse situation. For example, if humans were on Mars , examination of Earth for life with the full armory of contemporary scientific instrumentation and knowledge would be illuminating .

Given the size of the universe - there are at least 100 billion stars in our home galaxy alone and perhaps 100 billion galaxies of much the same size scattered throughout deep space - few scientists believe that the Earth is the only home of life.