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 or conclusively detected.

Jan 9, 2026 · Explore how physics and biology shape alien life forms, from microbes to complex organisms, in this science-based guide to extraterrestrial biology and life beyond Earth.

Aug 26, 2025 · With the rise of modern science, the question has become sharper, stripped of myth but not of awe: Are there aliens—or any other intelligent life forms—already here on Earth? This is not …

May 24, 2025 · Discover interesting facts about where alien life forms are likely to exist, and what they look like.

Feb 18, 2026 · Could any animals live on other planets? But what multi-cellular and potentially intelligent alien life forms might look like is another question entirely. The chances of them being little green …

May 31, 2024 · This article engages in a thought experiment, and hypothesizes ten distinct types of alien life forms that we might encounter during our search for extraterrestrial life.

Feb 6, 2026 · So far, the only life we know of is right here on planet Earth. But NASA is looking for signs of life in our solar system and on some of the the thousands of planets we've discovered beyond it, …

Feb 17, 2026 · 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 …

Feb 18, 2026 · But how much more diverse might life be on other worlds? Planets with different geology and chemistry, orbiting different types of stars, could yield an endless variety of life-forms.

Jan 25, 2025 · Discover how scientists blend biology, synthetic biology, and astrobiology to speculate on alien life forms, focusing on the shared characteristics that might transcend Earth’s biosphere.