Fresh evidence of volcanic activity on Mars is reshaping how scientists think about the planet’s potential to host life, past ...

Volcanoes are often framed as spectacular local disasters, but a growing body of research argues that the most dangerous ...

Key Findings The moon once dismissed as the solar system's most hostile environment may now sit directly in the path of an ...

Russia-Ukraine: Mr. Trump said he would dispatch envoys to meet separately with President Vladimir V. Putin of Russia and ...