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The new volcanic fissures are more otherworldly than they first appear.
New data indicating that Earth’s surface broke up about 3.2 billion years ago helps clarify how plate tectonics drove the evolution of complex life.
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.
A surprisingly youthful estimate of the age of the rings has stirred a backlash.