NASA’s Pandora mission has begun its hunt for secrets hidden in exoplanet atmospheres. The spacecraft will study at least 20 alien worlds and their host stars, helping scientists separate planetary ...

For centuries, humanity has looked toward the stars searching for signs of intelligent life. But what if the biggest discovery in human history is not finding aliens somewhere far away, but realizing ...

A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.