The Large Interferometer For Exoplanets (LIFE) mission, outlined in a recent W.M. Keck Institute for Space Studies report, proposes building a swarm of five telescopes to search for evidence of life on other worlds. Unlike the James Webb Space Telescope (JWST), which provides only atmospheric glimpses, LIFE would use interferometry—combining light from multiple telescopes—to directly image and analyze the atmospheres of Earth-like exoplanets.
The concept relies on a formation of small telescopes flying in precise coordination, effectively creating a virtual telescope far larger than any single observatory. This interferometric approach allows the fleet to block out a host star's glare and capture direct light from orbiting planets, enabling detailed spectroscopic analysis for biosignatures such as oxygen, methane, and water vapor.
LIFE is envisioned as a flagship mission for the 2040s, timed to capitalize on advancements in precision formation flying and space-based interferometry. No launch date or cost estimates have been announced; the mission is currently in the conceptual study phase. Its development would require overcoming significant engineering challenges, including maintaining sub-millimeter alignment between spacecraft over vast distances.
The primary scientific goal is to answer whether humanity is alone in the universe by definitively detecting signs of life on rocky exoplanets. LIFE would target nearby Sun-like star systems, complementing surveys from the Nancy Grace Roman Space Telescope and future ground-based observatories. The mission bridges a gap between current atmospheric characterization and the direct imaging capabilities needed for robust life detection.
Critics argue that the technological hurdles for space-based interferometry remain formidable, and that ground-based extremely large telescopes (ELTs) could achieve similar results sooner and at lower cost. NASA has not yet committed to the LIFE concept, and its feasibility will depend on future technology demonstrations and budgetary priorities within the agency's astrophysics division.