What Science Says About Life Beyond Earth
Many scientists consider it unlikely that Earth is the only planet with life. The Milky Way contains billions of Earth-sized planets in habitable zones, where liquid water could exist.
NASA and the Search for Extraterrestrial Life
NASA studies potentially habitable worlds using telescopes and robotic missions. Missions such as the Mars rovers analyze soil and rocks for signs of past microbial life.
Why Researchers Continue the Search
Researchers use radio telescopes and space observatories to scan for biosignatures and technosignatures. Each new exoplanet discovery helps refine models of where life might survive.
