Leonard Searle (October 23, 1930 – July 2, 2010) was an English-born American astronomer who worked on theories of the

Big Bang The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models of the Big Bang explain the evolution of the observable universe from the ...

. He was born in

Mitcham Mitcham is an area within the London Borough of Merton in South London, England. It is centred southwest of Charing Cross. Originally a village in the county of Surrey, today it is mainly a residential suburb, and includes Mitcham Common. It ha ...

, a suburb of London, and studied at

St Andrews St Andrews ( la, S. Andrea(s); sco, Saunt Aundraes; gd, Cill Rìmhinn) is a town on the east coast of Fife in Scotland, southeast of Dundee and northeast of Edinburgh. St Andrews had a recorded population of 16,800 , making it Fife's fou ...

Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ...

and

Princeton Princeton University is a private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth as the College of New Jersey, Princeton is the fourth-oldest institution of higher education in the United States and one of the nine ...

New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...

. After receiving his doctorate he started working at the

University of Toronto The University of Toronto (UToronto or U of T) is a public research university in Toronto, Ontario, Canada, located on the grounds that surround Queen's Park. It was founded by royal charter in 1827 as King's College, the first institution ...

in 1953, leaving in 1960 for the

California Institute of Technology The California Institute of Technology (branded as Caltech or CIT)The university itself only spells its short form as "Caltech"; the institution considers other spellings such a"Cal Tech" and "CalTech" incorrect. The institute is also occasional ...

. In 1963 he moved to

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

for a post at the

Mount Stromlo Observatory Mount Stromlo Observatory located just outside Canberra, Australia, is part of the Research School of Astronomy and Astrophysics at the Australian National University (ANU). History The observatory was established in 1924 as The Commonwea ...

, before settling finally at the Carnegie observatories in

Pasadena Pasadena ( ) is a city in Los Angeles County, California, northeast of downtown Los Angeles. It is the most populous city and the primary cultural center of the San Gabriel Valley. Old Pasadena is the city's original commercial district. Its ...

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, in 1968. In 1989 he became director of the Carnegie Observatories. In 1996

University of Warsaw The University of Warsaw ( pl, Uniwersytet Warszawski, la, Universitas Varsoviensis) is a public university in Warsaw, Poland. Established in 1816, it is the largest institution of higher learning in the country offering 37 different fields of ...

awarded him doctorate honoris causa (supervised by

Marcin Kubiak Marcin Antoni Kubiak is a Polish astrophysicist, who obtained his professorship title on 25 April 1994. Member of Committee of Astronomy of the Polish Academy of Sciences, a member of the Optical Gravitational Lensing Experiment (OGLE), co-discove ...

). Searle's work focused on the conditions of the Big Bang and the early universe, and on the formation of heavy elements in stars. One of his main fields of study was the abundance of

helium Helium (from el, ἥλιος, helios, lit=sun) is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. ...

in the early universe. With

Wallace Sargent Wallace Leslie William Sargent (February 15, 1935 – October 29, 2012) was a British-born American astronomer and the Ira S. Bowen Professor of Astronomy at California Institute of Technology. Education Sargent was born in Elsham, No ...

he developed a model to calculate the

hydrogen Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula . It is colorless, odorless, tasteless, non-toxic, an ...

-to-helium composition of

galaxies A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...

. As director of the Carnegie Observatories, he was also central to the construction of the

Las Campanas Observatory Las Campanas Observatory (LCO) is an astronomical observatory owned and operated by the Carnegie Institution for Science (CIS). It is in the southern Atacama Desert of Chile in the Atacama Region approximately northeast of the city of La Serena. ...

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

, considered the best natural imaging telescopes in the world. Searle married Eleanor Millard, whom he met at Princeton, in 1952. Eleanor Searle, a

medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the Post-classical, post-classical period of World history (field), global history. It began with t ...

historian, died in 1999.

References

{{DEFAULTSORT:Searle, Leonard 1930 births 2010 deaths American astronomers Alumni of the University of St Andrews English emigrants to the United States Princeton University alumni University of Toronto faculty California Institute of Technology faculty