California heat wave prompts power shutdowns, fire danger

More than 50,000 California utility customers were without power and others around the state were urged to conserve electricity Thursday amid a fall heat wave that brought another round of extreme wildfire danger.

Two killed in hurricane-like storm in Greece

Two people were found dead and another person was missing on Saturday after central Greece was lashed by a rare hurricane-like storm known as a "medicane".

How planetary nebulae get their shapes

About 7.5 billion years from now, our sun will have converted most of its hydrogen fuel into helium through fusion, and then burned most of that helium into carbon and oxygen. It will have swollen to a size large enough to ...

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