Chelyabinsk a decade on: The sun's invisible asteroids

No one saw the Chelyabinsk meteor of February 15, 2013 coming—the largest asteroid to strike Earth in over a century. Just after sunrise on a sunny winter's day, a 20-meter, 13,000-ton asteroid struck the atmosphere over ...

State of emergency declared in storm-battered California

Excessive rain, heavy snow and landslides are expected to wallop California through Thursday as a series of winter storms rip across the western US coast, prompting the Golden State's governor to declare a state of emergency.

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