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The lower boundary of the exosphere is called the critical level of escape, where atmospheric pressure is very low (the gas atoms are very widely spaced) and the temperature is very low. The exosphere is the upper part of Earth's atmosphere. it is 10,000 km from earth. The exosphere goes from about 400 miles (640 km) high to about 800 miles (1,280 km). The exosphere is the uppermost layer of Earth’s atmosphere and marks a transitional zone between the atmosphere’s lower layers and interplanetary space. The exosphere is the uppermost layer of Earth’s atmosphere, and is point at which the atmosphere becomes thin and merges with interplanetary space. Extending from the top of the thermosphere to 6,200 miles (10,000 km) above Earth is the exosphere, where weather satellites are. Earth's atmosphere has a series of layers, each with its own specific traits. The exosphere is the outermost layer of the atmosphere (that is, it is the upper limit of the atmosphere) and extends from the exobase, which is located at the top of the thermosphere. The Moon orbits about 250,000 miles above the Earth, while the exosphere only extends up about 100 miles. From an average distance of 93 million miles (150 million kilometers), Earth is exactly one astronomical unit away from the Sun because one astronomical unit (abbreviated as AU), is the distance from the Sun to Earth. It starts at about 500 km and gradually extends into the vacuum of outer space at about 190,000 km. This outer layer of the atmosphere is approximately 6,200 miles thick and contains gases such as helium and hydrogen, as well as traces of carbon dioxide and oxygen. The exosphere is the outermost layer of Earth's atmosphere. At its closest point of orbit, the Moon is 363,300 kilometres (225,700 miles) from Earth, while at its furthest point it is over 384,400 kilometres (238,900 miles) away. The exosphere is found on the very boundaries of Earth's atmosphere. 2.5 The exosphere. James G. Speight, in Natural Water Remediation, 2020. Theoretically, the Exosphere extends out to around 190,000 km (120,00 miles) from the surface of the earth, which is about halfway to the moon. •Exosphere: The exosphere is the outermost layer of the Earth's atmosphere. The upper boundary of the exosphere can be defined as the distance at which the influence of solar radiation pressure on atomic hydrogen exceeds that of Earth's gravitational pull. Although it is thin, it absorbs radiation that the sun gives off, shielding the layers of the atmosphere underneath. This layer has very few atmospheric molecules, which can escape into space. It starts at an altitude of about 500 km and goes out to about 10,000 km. Troposphere. 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