Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

"...an interstellar traveler will not correspond with its senders because there is no benefit to that": Prof Loeb ...

Scientists have discovered more than 6,000 planets beyond our solar system. What if some of them aren't planets at all, but ...

The findings potentially solve the paradox of how liquid water seems to have persisted on Mars even when the climate grew too ...