Strong 6.4-magnitude quake rocks northern Philippines

A 6.4-magnitude earthquake rocked the northern Philippines late Tuesday, the US Geological Service said, sending panicked residents out into the streets and causing substantial damage to a hospital.

NASA image: Night-shining clouds

In the late spring and summer, unusual clouds form high in the atmosphere above the polar regions of the world. As the lower atmosphere warms, the upper atmosphere gets coooler, and ice crystals form on meteor dust and other ...

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