|Source :- NASA|
39 light years is sure is very far from Earth. All the planets are discovered orbiting a single star in the Trappist-1 system.Three of the seven Earth-sized planets are found within the star's habitable zone, meaning liquid water, and even more amazingly, life, could exist on the planets' surfaces.
The planets were observed with the Spitzer Space Telescope, an infrared telescope launched in 2003. Spitzer was never intended to study exoplanets, but it was re-engineered from Earth by NASA to detect dips in light as the planets pass in front of the star. The dip in light level provides insight into the planets' approximate sizes.
|NASA travel poster for the Trappist-1 System|
While we won't be traveling to any of the planets in our lifetimes, NASA approved a Mars mission in 2018 to further study our closest neighbor for future human visitation.