Asteroid or comet? Meteor or meteorite? How to identify and classify the rocks you see streaking through the sky

An observatory director describes the differences between the types of rocks that fly through space.

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ISS Astronaut Shares Incredible Photos of Volcanoes Taken From Space

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National Geographic

Why the heat index matters more than just the temperature

The number on the thermometer only tells half the story. Here’s what to know about heat index—and why some scientists are rethinking how it is calculated.

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