The layer that reaches the highest altitude in the Earth's atmosphere is the exosphere. It extends from about 700 km (440 miles) above the Earth's surface and gradually transitions into space.
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Auroras occur in the thermosphere, which is the second-highest layer of Earth's atmosphere. The thermosphere is located between the mesosphere and the exosphere, at an altitude ranging from about 80 km to 600 km above the Earth's surface.
There is no definitive answer to this question as it depends on a number of factors, including the definition of 'highest altitude'. For example, if you are referring to the highest point on Earth's surface, this is Mount Everest, which has an altitude of 8,848 metres (29,029 feet). However, if you are referring to the highest altitude ever reached by a human, this is 10,908 metres (35,787 feet), which was accomplished by Felix Baumgartner during a skydive from a helium balloon in 2012.
It is 87 km of altitude.
The highest altitude on Mt. Everest is 29,032 feet or 8,848 meters at the summit.
The altitude at the highest point of Mount Everest is 29,032 feet (8,848 meters) above sea level.