The exosphere is the outermost layer of Earth's atmosphere (though it is so tenuous that some scientists consider it to be part of interplanetary space rather than part of the atmosphere). mi; 30,000 ft) at the geographic poles to 17 km (11 mi; 56,000 ft) at the Equator, [21] with some variation due to weather.

For example, the Sun is approximately 6,000 K (5,730 °C; 10,340 °F), its radiation peaks near 500 nm, and is visible to the human eye.

One example is that, under some circumstances, observers on board ships can see other vessels just over the horizon because light is refracted in the same direction as the curvature of Earth's surface. Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. It contains the ozone layer, which is the part of Earth's atmosphere that contains relatively high concentrations of that gas. From majestic landscapes to rubbish dumps, the images are shockingly beautiful, but for Yann the most important part is the powerful environmental message which accompanies each image.

Various authorities consider it to end at about 10,000 kilometres (6,200 mi) [23] or about 190,000 kilometres (120,000 mi)—about halfway to the moon, where the influence of Earth's gravity is about the same as radiation pressure from sunlight.The troposphere is bounded above by the tropopause, a boundary marked in most places by a temperature inversion (i. Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer. In addition to the images for which the original is renowned, this version includes 100 new photographs and seven new essays by experts on environmental issues. Because in an ideal gas of constant composition the speed of sound depends only on temperature and not on pressure or density, the speed of sound in the atmosphere with altitude takes on the form of the complicated temperature profile (see illustration to the right), and does not mirror altitudinal changes in density or pressure.

Nearly all atmospheric water vapor or moisture is found in the troposphere, so it is the layer where most of Earth's weather takes place. The atmosphere changed significantly over time, affected by many factors such as volcanism, life, and weathering. Our current partner charities in the UK are READ International, the National Literacy Trust, Room to Read. Blue light is scattered more than other wavelengths by the gases in the atmosphere, surrounding Earth in a visibly blue layer at the stratosphere, above the clouds of the troposphere, when seen from space on board the ISS at an altitude of 335 km (208 mi) (the Moon is visible as a crescent in the far background).The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere.

Although variations do occur, the temperature usually declines with increasing altitude in the troposphere because the troposphere is mostly heated through energy transfer from the surface. In May 2017, glints of light, seen as twinkling from an orbiting satellite a million miles away, were found to be reflected light from ice crystals in the atmosphere.The pictures cover every corner of ever continent, from icy arctic floes to tropical forests, from the deserts of north Africa to the vertiginous peaks of Nepal. Although the thermosphere has a high proportion of molecules with high energy, it would not feel hot to a human in direct contact, because its density is too low to conduct a significant amount of energy to or from the skin. During the day the planetary boundary layer usually is well-mixed, whereas at night it becomes stably stratified with weak or intermittent mixing.