Mexico keeps close watch on ash-spewing volcano

A volcano southeast of the Mexican capital spewed more gas and ash into the sky on Tuesday as authorities maintained their warning level at one step below red alert.

Severe solar storm creates dazzling auroras farther south

An intense solar storm has the northern lights gracing the skies farther south than usual. A blast of superhot material from the sun late last week hurled scorching gases known as plasma toward Earth at nearly 2 million mph ...

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