This 12-minute video explains how our solar system works, focusing on how astronomers have searched for other stars and planets. Astronomers think there may be many billions of Earth-like planets in our galaxy.
Learn more about NASA's Exoplanet Program, dedicated to the discovery and understanding of planetary systems around nearby stars. You can learn about new discoveries and how many exoplanets have already been discovered.
The James Webb Space Telescope plays a key role in discovering how planets form around other stars and learning about their atmospheres. Scroll down the page to read about exoplanets and their similarity to Earth.