The exosphere is the outermost layer of Earth's atmosphere. Although it is thin, it absorbs radiation that the sun gives off, shielding the layers of the atmosphere underneath.Know More
The exosphere is found on the very boundaries of Earth's atmosphere. Just underneath the exosphere is the thermosphere, which shrinks and expands according to how much ultraviolet radiation is coming through the exosphere.
According to the National Center for Atmospheric Research, some scientists don't even consider the exosphere a part of Earth's atmosphere. They consider it a part of outer space, as there isn't a distinct upper boundary of the exosphere.
There is a region in the exosphere called the geocorona. This is where the sun's radiation exerts pressure on hydrogen atoms, and these hydrogen atoms scatter ultraviolet radiation and glow as a result. This is a sign that the exosphere has an important role in absorbing radiation and protecting the layers underneath. If the radiation were allowed through the exosphere, it may be harmful to the layers underneath.
As mentioned before, when the thermosphere is exposed to radiation from the sun, it expands. If not for the exosphere providing a boundary for the thermosphere, the thermosphere might never stop expanding, and Earth's atmosphere wouldn't function properly. If Earth's atmosphere doesn't function properly, then neither can Earth's ecosystem.Learn more about Atmosphere
The air pressure in the exosphere is extremely low due to its high altitude and the distance between the molecules it contains. The exosphere is the Earth's uppermost atmospheric layer, and it is not highly affected by the Earth's gravitational pull.Full Answer >
Earth's atmosphere has gone through multiple distinct phases throughout its life, from a hydrogen-rich early period to the modern oxidizing chemistry. The first atmosphere Earth had was chemically very similar to the composition of the primordial dust and gas cloud from which the solar system formed. This chemistry can be seen in some asteroids, and it is a combination of hydrogen, helium and complex organic molecules.Full Answer >
According to USA Today, the coldest time of the day comes just before sunrise because the earth has had all night to expel the heat from the previous day into the atmosphere. As soon as the sun begins to rise, the earth will immediately begin to heat up once again.Full Answer >
Clouds serve as reflectors of incoming solar radiation, also called insolation, which is the short-wave radiated energy from the sun that propagates through the Earth's atmosphere. However, the extent to which an individual cloud reflects insolation depends on its thickness, as thin clouds reflect less insolation than thick clouds.Full Answer >