WASHINGTON (AP) — Maryland Sen. Chris Van Hollen was flying home from El Salvador on Friday after meeting with Kilmar Abrego ...

The exoplanet K2-18b could harbor a massive ocean, but scientists will need to study the planet more to see if it’s really ...

A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But ...

NASA's Perseverance rover has revealed new clues about Mars' volcanic past. While most people searching for signs of alien ...

Tutolo led a new study of rock samples collected by the Curiosity rover that might have answered this question. The mystery ...

A rare 'smiley face' triple conjunction is coming to Earth's morning skies on April 25, when Venus, Saturn and the crescent ...