If you've ever spied a night sky splashed with vivid billows of color, either you have access to interesting drugs or you've seen an aurora firsthand. If it's the latter, your sky-gazing probably took place during spring or autumn. How come?
WHAT'S INSIDE: FORCES OF NATURE
- Climate & Weather
- Natural Disasters
FEATURED: FORCES OF NATURE
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It seems like every few years someone comes out with a new doomsday prophecy. From aliens and asteroids to floods and earthquakes, how do people think the world will end?
Earthquakes, like volcanoes, happen all the time -- but most of them are so minor we can't even feel them. They're also similar to volcanoes in that we can't fully predict them, and scientists are always waiting for the next big one to occur.