The James Webb Space Telescope has observed water clouds on an alien world for the first time, and it's not a planet. Credit: ...

Alien worlds take center stage in an extraordinary voyage across the Milky Way, revealing planets far stranger than anything found in our Solar System. The journey begins beyond Neptune before ...

A "baby" exoplanet, discovered emerging from its cosmic cocoon around a nearby star, is the youngest alien world ever seen, a new study reveals. The planetary infant is less than 1 million years old ...

When the James Webb Space Telescope detected potential biosignatures in the atmosphere of K2-18 b last year, the discovery sparked intense debate. Here was a sub-Neptune exoplanet 124 light years away ...

This artistic illustration of the Pink Planet, or GJ504b, orbiting its host star. Astronomers think the object is pink because it's incredibly old (between 2.5 billion and 4 billion years old) and ...