Earth's atmosphere is about 78 percent nitrogen, 21 percent oxygen, with trace amounts of water, argon, carbon dioxide and other gases. The exact composition, as well as the temperature and pressure of the atmosphere, varies with its height. The atmosphere is divided into layers: The troposphere is the lowest layer and extends from Earth's surface up to a height of about 30 miles (48 kilometers); it is where most of Earth's weather occurs. Above the troposphere is the stratosphere, where the ultraviolet-blocking ozone layer is found. Above that is the mesosphere, the thermosphere and the ionosphere. Earth's atmosphere is home to different types of clouds, the auroras, different types of lightning.
A loud explosion heard Saturday (Aug. 13) in Utah may have been an exploding Perseid meteor.
Stars appear to twinkle because the light from these distant objects passes through wobbly air in the atmosphere.
Millions of tons of a type of extremely reactive chemical can form in the atmosphere each year, with implications for health and the global climate.
The atmosphere is vast and parts of it extend beyond the moon. But where does it technically end, according to scientists?
The permanent oxygenation of Earth's atmosphere took twice as long as previously believed and finally finished up to 100 million years later than expected.
Lightning storms on early Earth may have given the planet enough phosphorus to craft the first DNA and RNA molecules, study suggests
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