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The exosphere is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is so low that the molecules are essentially collision-less. [1]
Rujm el-Hiri is an ancient megalithic monument consisting of concentric circles of stone with a tumulus at center, in the Golan Heights, territory occupied by Israel. It is believed that the site was used as an ancient calendar. At the times of the two equinoxes, the sun's rays would pass between two rocks, at the eastern edge of the compound.
The ionosphere (/ aɪ ˈ ɒ n ə ˌ s f ɪər /) [1] [2] is the ionized part of the upper atmosphere of Earth, from about 48 km (30 mi) to 965 km (600 mi) above sea level, [3] a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation.
Map showing the extent of Mesopotamia. The geography of Mesopotamia, encompassing its ethnology and history, centered on the two great rivers, the Tigris and Euphrates.While the southern is flat and marshy, the near approach of the two rivers to one another, at a spot where the undulating plateau of the north sinks suddenly into the Babylonian alluvium, tends to separate them still more ...
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). It extends from the thermopause (also known as the "exobase") at the top of the thermosphere to a poorly defined boundary with the solar wind and ...
The thermosphere and exosphere begin at around 95 kilometres, eventually reaching the limit of the atmosphere at about 220 to 250 km. The air pressure at Venus' surface is about 92 times that of the Earth.
Evidence of possibly the oldest forms of life on Earth has been found in hydrothermal vent precipitates. [1]The earliest known life forms on Earth may be as old as 4.1 billion years (or Ga) according to biologically fractionated graphite inside a single zircon grain in the Jack Hills range of Australia. [2]
North Face of Everest as seen from the path to North Base Camp Everest and Lhotse from the south (Nepal): in the foreground are Thamserku, Kangtega, and Ama Dablam. Mount Everest, known locally as Sagarmatha or Qomolangma, [note 4] is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas.