Only a few years ago, astronomers heralded the discovery of a rocky world circling the sun 's closest space neighbor, Proxima Centauri.

An exoplanet has been discovered orbiting Barnard's star by the European Southern Observatory’s Very Large Telescope. Barnard ...

Only a few years ago, astronomers heralded the discovery of a rocky world circling the sun's closest space ... is quite different from Earth's own. Although the exoplanet, Proxima b, orbits ...

Proxima Centauri, a star four light-years from the sun, shoots out a violent solar flare in this artist's depiction.

Astronomers announced Thursday that they had detected the most promising "hints" of potential life on a planet beyond our ...

K2-18b is an exoplanet located around 124 light-years from Earth in the constellation of Leo. It is 2.6 times larger and 8.6 times as massive than Earth, and experts believe it is likely covered ...

Astronomers have confirmed the existence of four rocky planets orbiting Barnard’s Star, our nearest solitary stellar neighbor ...

Using the James Webb Space Telescope, scientists say they found indications of potential life on K2-18b, a planet outside our solar system.

So in some sense, alien worlds were not first discovered in the 1990s or even the 1980s. It took nearly a century to fully understand it, but the first evidence for exoplanets was found in 1917.