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Home Comparison of noctilucent cloud coverage in 1880 versus 1990. They have increased over time. (Credit: NASA) Comparison of noctilucent cloud coverage in 1880 versus 1990. They have increased over time. (Credit: NASA)

Comparison of noctilucent cloud coverage in 1880 versus 1990. They have increased over time. (Credit: NASA)

Comparison of noctilucent cloud coverage in 1880 versus 1990. They have increased over time. (Credit: NASA)

Comparison of noctilucent cloud coverage in 1880 versus 1990. They have increased over time. (Credit: NASA)

Astronauts on board the ISS took this picture of noctilucent clouds near the top of Earth’s atmosphere on July 13th, 2012. (Credit: NASA)

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