Two Earth-like alien worlds with a mass similar to that of Earth have been found in the habitable zone of a star.
And any idea that suggests that aliens may live on Earth while hiding in plain sight becomes quite a, well, alien thought. But that is exactly what one of NASA’s top astrobiologists maintains could be true: aliens may live on Earth. But we wouldn’t know.
Caltech researchers find strong evidence of a new planet in the Solar System’s outer reaches and hope to confirm it.
Astronomers are stunned: they find an ultra-giant galaxy equal to 150 times ours, and they’re trying to figure out how Alcyoneus came to life.