On the surface, Young and Duke collected of lunar samples for return to Earth, while Command Module Pilot Ken Mattingly orbited in the Command / Service Module above to perform observations.

On the return trip to Earth, Mattingly performed a one-hour spacewalk to retrieve several film cassettes from the exterior of the Service Module.

On Earth, small amounts of new atoms are naturally produced in nucleogenic reactions, or in cosmogenic processes, such as cosmic ray spallation.

On Earth ( and elsewhere ), trace amounts of various elements continue to be produced from other elements as products of natural transmutation processes.

On other planets and moons that experience more-active surface geological processes, such as Earth, Venus, Mars, Europa, Io and Titan, visible impact craters are less common because they become eroded, buried or transformed by tectonics over time.

On Earth, ignoring the slowing effects of travel through the atmosphere, the lowest impact velocity with an object from space is equal to the gravitational escape velocity of about 11 km / s.

On Earth, the recognition of impact craters is a branch of geology, as opposed to astronomy on other worlds.

* On July 7, 2007, the beach hosted the Brazilian leg of the Live Earth concerts, which attracted 400, 000 people.

On each of the last three of these missions, astronauts also performed deep-space EVAs on the return to Earth, to retrieve film canisters from the outside of the spacecraft.

On 21 December 2008 the full moon occurred closer to the Earth than it has done at any time for the past 15 years.

* Boethius ( c. 480 – 524 ), who also wrote a theological treatise On the Trinity, repeated the Macrobian model of the Earth in the center of a spherical cosmos in his influential, and widely translated, Consolation of Philosophy.

On the surface, an inventor named Goro Ibuki, his nephew Rokuro and their friend Hiroshi Jinkawa are off on an outing near a lake when Seatopia makes itself known to the Earth by drying up the lake the trio was relaxing nearby and using it as a base of operation ( unknown to our heroes.

The study of the physical material of the Earth dates back at least to ancient Greece when Theophrastus ( 372-287 BCE ) wrote the work Peri Lithon ( On Stones ).

On Earth it is thus relatively rare — 0. 00052 % by volume in the atmosphere.

On March 26, 1895, Scottish chemist Sir William Ramsay isolated helium on Earth by treating the mineral cleveite ( a variety of uraninite with at least 10 % rare earth elements ) with mineral acids.

On Earth, the cold side of any heat engine is limited to being close to the ambient temperature of the environment, or not much lower than 300 Kelvin, so most efforts to improve the thermodynamic efficiencies of various heat engines focus on increasing the temperature of the source, within material limits.

In one chapter of his book On the Wild Side ( 1992 ), Martin Gardner discusses the hollow Earth model articulated by Abdelkader.

Jarmusch's distinctive aesthetic and auteur status fomented a critical backlash at the close of this early period, however ; though reviewers praised the charm and adroitness of Mystery Train and Night On Earth, the director was increasingly charged with repetitiveness and risk-aversion.

On the night side of the Earth, the solar wind drags the ionosphere further away, thereby greatly increasing the range which radio waves can travel by reflection, called skywave.

On the surface of Earth, it occurs naturally only in meteorites.

On the article by Max Baginski called " Stirner: The Ego and His Own " published in the American anarchist magazine Mother Earth there is the following affirmation " Modern Communists are more individualistic than Stirner.

On Earth in the mid 21st century it became possible to transplant any organ from any person to another, with the exception of brain and central nervous system tissue.

On the surface of the Earth, an object with a mass of 50 kilograms weighs 491 Newtons ; on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81. 5 Newtons.

On some occasions in the mythology, the Sky Lord as identified as a male has been associated to mate with an Earth Mother, while some traditions kept the omnipotence of the Sky Lord unshared.

On the parliamentary elections in 2009 the newly established personalistic party of Boyko Borisov-Citizens for European Development of Bulgaria ( GERB ) won the elections, securing 116 seats out of 240, which enabled it to form a cabinet alone.

On October 23, 1991, the Paris Conference reconvened to sign a comprehensive settlement giving the UN full authority to supervise a cease-fire, repatriate the displaced Khmer along the border with Thailand, disarm and demobilize the factional armies, and prepare the country for free and fair elections.

On 28 February 2011 ONUCI consisted of 7, 568 troops, 177 military observers, and numerous international civilians and Police ; the mission had received helicopter and infantry reinforcement from UNMIL during the stand-off since the late 2010 elections which had been won by Alassane Ouattara.

On 22 April and 7 May 1990, the first free multi-party elections were held in Croatia.

On 15 May 2006, Ahmed Abdallah Sambi, a cleric and successful businessman educated in Iran, Saudi Arabia and Sudan, was declared the winner of elections for President of the Republic.

On 18 and 19 December 2005, a successful nationwide referendum was carried out on a draft constitution which set the stage for elections in 2006.

On 19 March, a constitutional referendum was voted on and passed reforming the laws surrounding the power and election of the presidency, limiting the presidency to two four-year terms, providing judicial supervision of elections, requiring the president to appoint a deputy, calling for a commission to draft a new constitution following the parliamentary election, and providing easier access to presidential elections by candidates ( 30, 000 signatures from at least 15 provinces, 30 members of a chamber of the legislature, or nomination by a party holding at least one seat in the legislature ).

On November 27 it was announced that a NATO membership referendum and election date referendum will also be held on the election day together with presidential elections.

On 10 October 1951 Grenada held its first general elections on the basis of universal adult suffrage-United Labour won 6 of the 8 elected seats on the Legislative Council in both the 1951 and 1954 elections.

On November 29, democratic general elections were held, with former Congressional president and 2005 nominee, Pepe Lobo as victor.

On 7 July 2012, Libyans voted in their first parliamentary elections since the end of the dictatorship of Moammar Gadhafi.

On 22 March 1992 the Communists were trumped by the Democratic Party in national elections.

On June 5, 2008, Ice-T jokingly stated that he would be voting for John McCain in the 2008 American elections.

On polling day Atambayev withdrew his candidacy claiming widespread fraud, stating " due to massive, unprecedented violations, we consider these elections illegitimate and a new election should be held.

On 15 April 1961, the MCP won an overwhelming victory in elections for a new Legislative Council.

On June 15, 1999, Malawi held its second democratic elections.

On 10 November 2007, a mass rally, called the 2007 Bersih Rally, took place in the Dataran Merdeka Kuala Lumpur at 3pm to demand for clean and fair elections.

* 1980 – On the eve of presidential elections, Maoist guerrilla group Shining Path attacks a polling location in the town of Chuschi, Ayacucho, starting the Internal conflict in Peru.

On 11 March 1973, Argentina held general elections for the first time in ten years.

On 19 July 2006, the prime minister, G. P. Koirala, sent a letter to the United Nations announcing the intention of the Nepalese government to hold elections to a constituent assembly by April 2007.

On 9 October 2004, Afghanistan elected Hamid Karzai President in its first direct elections.