Mount Everest, also known in Nepal as Sagarmāthā and in China as Chomolungma, is Earth's highest mountain.
Earth is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life.
Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia with a population of 26.4 million.
China, officially the People's Republic of China, is a unitary sovereign state in East Asia.
Mt. Everest Deaths: Mountain Climbers' Crowded Trail Seen in Video by ABC News
Its peak is 8,848 metres above sea level.
Mean sea level is an average level of the surface of one or more of Earth's oceans from which heights such as elevations may be measured.
Storm Over Everest by ajvaughan3 Documentary Films
Its massif includes neighbouring peaks Lhotse, 8,516 m ; Nuptse, 7,855 m, and Changtse, 7,580 m.
Changtse is a mountain situated between the Main Rongbuk and East Rongbuk Glaciers in Tibet, China, immediately north of Mount Everest.
Lhotse is the fourth highest mountain in the world at 8,516 metres, after Mount Everest, K2, and Kangchenjunga.
Nuptse or Nubtse is a mountain in the Khumbu region of the Mahalangur Himal, in the Nepalese Himalayas.
In 1856, the Great Trigonometrical Survey of India established the first published height of Everest, then known as Peak XV, at 8,840 m. The current official height of 8,848 m as recognised by China and Nepal was established by a 1955 Indian survey and subsequently confirmed by a Chinese survey in 1975.
The Great Trigonometrical Survey was a project which aimed to measure the entire Indian subcontinent with scientific precision.
In 2005, China remeasured the height of the mountain and got a result of 8844.43 m. An argument regarding the height between China and Nepal lasted five years from 2005 to 2010.
China argued it should be measured by its rock height which is 8,844 m but Nepal said it should be measured by its snow height 8,848 m. In 2010, an agreement was finally reached by both sides that the height of Everest is 8,848 m and Nepal recognises China's claim that the rock height of Everest is 8,844 m.
In 1865, Everest was given its official English name by the Royal Geographical Society upon a recommendation by Andrew Waugh, the British Surveyor General of India.
The Royal Geographical Society is the UK's learned society and professional body for geography, founded in 1830 for the advancement of geographical sciences.
The Surveyor General of India is the Head of Department of Survey of India, a Department under the Ministry of Science and Technology of Government of India.
As there appeared to be several different local names, Waugh chose to name the mountain after his predecessor in the post, Sir George Everest, despite George Everest's objections.
Colonel Sir George Everest FRS, FRAS was a Welsh surveyor and geographer, and the Surveyor General of India from 1830 through 1843.
Mount Everest attracts many climbers, some of them highly experienced mountaineers.
There are two main climbing routes: one approaching the summit from the southeast in Nepal and the other from the north in Tibet, China.
While not posing substantial technical climbing challenges on the standard route, Everest presents dangers such as altitude sickness, weather, and wind as well as significant hazards from avalanches and the Khumbu Icefall.
The Khumbu Icefall is an icefall located at the head of the Khumbu Glacier and the foot of the Western Cwm, which lies at an altitude of 5,486 metres on the Nepali slopes of Mount Everest, not far above Base Camp and southwest of the summit.
Altitude sickness—also known as acute mountain sickness, is a pathological effect of high altitude on humans, caused by acute exposure to low partial pressure of oxygen at high altitude.
An avalanche is a rapid flow of snow down a sloping surface.
As of 2016 there are well over 200 corpses on the mountain, with some of them even serving as landmarks.
A landmark is a recognizable natural or artificial feature used for navigation, a feature that stands out from its near environment and is often visible from long distances.
The first recorded efforts to reach Everest's summit were made by British mountaineers.
With Nepal not allowing foreigners into the country at the time, the British made several attempts on the north ridge route from the Tibetan side.
After the first reconnaissance expedition by the British in 1921 reached 7,000 m on the North Col, the 1922 expedition pushed the north ridge route up to 8,320 m, marking the first time a human had climbed above 8,000 m. Tragedy struck on the descent from the North Col when seven porters were killed in an avalanche.
The North Col refers to the sharp-edged pass carved by glaciers in the ridge connecting Mount Everest and Changtse in Tibet, It forms the head of the East Rongbuk Glacier.
The 1924 expedition resulted in one of the greatest mysteries on Everest to this day: George Mallory and Andrew Irvine made a final summit attempt on 8 June but never returned, sparking debate as to whether they were the first to reach the top.
George Herbert Leigh Mallory was an English mountaineer who took part in the first three British expeditions to Mount Everest, in the early 1920s.
They had been spotted high on the mountain that day but disappeared in the clouds, never to be seen again, until Mallory's body was found in 1999 at 8,155 m on the north face.
Tenzing Norgay and Edmund Hillary made the first official ascent of Everest in 1953 using the southeast ridge route.
Tenzing Norgay OSN GM, born Namgyal Wangdi and often referred to as Sherpa Tenzing, was a Nepali Sherpa mountaineer.
Sir Edmund Percival "Ed" Hillary KG ONZ KBE was a New Zealand mountaineer, explorer, and philanthropist.