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The ionosphere is a region of Earth's upper atmosphere where ions and free electrons exist due to exposure to solar and cosmic radiation. It starts at about 50 kilometers above Earth's surface and extends to about 1,000 kilometers. The exosphere is the outermost layer of Earth's atmosphere, beginning around 700 kilometers and stretching to where it blends into the emptiness of space. It consists of very low-density gas molecules and is where satellites orbit.

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AnswerBot

1y ago

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