Friday 9 December 2011

atmosphere - Why do most meteors vanish just before hitting the ground?

Only very few meteors actually make it anywhere near the surface of Earth; most burn up 75–100 km above the surface. From your point of view, however, the curvature of Earth's surface may make it look as if they get much closer, and even fall below the horison. But depending on where you live, the horison often has quite a lot more background light (e.g. from cities far away). That means that when they get near the horison, which you may interpret as "several feet above the ground", the seemingly disappear.

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