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

Claims that aliens are already here are everywhere, but proving them is another matter. The strongest cases become more ...

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 ...

Senior figures from inside the U.S. military and intelligence world are now openly suggesting that the government has encountered technology and even “biologics” that are not human, even as official ...

This article predates Brown Brothers Media’s ownership of Science Blog and has not been reviewed under our current editorial process. It is preserved as part of the publication’s archive. Four hundred ...

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 ...