About 60 million years ago, India plowed into Eurasia and pushed up the Himalayas. But when Lucía Pérez-Díaz reconstructed the event in detail, she found that its central mystery depended on a broken geological clock.
The new volcanic fissures are more otherworldly than they first appear.
Small and cold, Mars has long been considered a dead planet. But a series of recent discoveries has forced scientists to rethink how recently its insides stopped churning — if they ever stopped at all.
The “pinball” model of a slipping fault line borrows from the mathematics of avalanches.
A surprisingly youthful estimate of the age of the rings has stirred a backlash.
A giant star’s death throes may offer the first evidence of a pair-instability supernova, and a glimpse of the first stars in the universe.