Geller , Margaret Joan

Geller , Margaret Joan
(1947–) American astronomer
The daughter of a crystallographer from Ithaca, New York State, Geller was encouraged as a small child to study science and mathematics. She was educated at the University of California, Berkeley, and at Princeton where she obtained her PhD in 1975. After a period at the Institute of Astronomy, Cambridge, England, Geller moved to Harvard in 1980 and was appointed professor of astronomy in 1988. She is also a staff member of the Smithsonian Astrophysical Observatory.
Since the early 1980s Geller and her coworkers have been carrying out for the Center for Astrophysics (CfA) a red-shift survey of some 15,000 galaxies. The intention is to map all galaxies above a certain brightness, out to about 650 million light years, in a particular sector of the heavens. They were aware that to some observers the sky lacked the uniformity predicted by the big-bang theory. In 1981, for example, a 100-million-light-year gap had been discovered in the constellation Bootes. Geller considered the possibility that this was a local phenomenon, and that the predicted homogeneity would become more apparent on a much larger scale. Further investigations were expected to show a uniform distribution of galaxies.
But when they came to plot the distribution of galaxies they saw neither a uniform spread, nor a random scattering of galaxies, but large-scale clusters grouped into enormous structures. The largest of these, dubbed the Great Wall, stretches for more than 500 million light-years. It was difficult to see how anything as massive could have been formed within the context of current cosmological theory; when Geller reported the initial results of the CfA survey in 1989 she noted, “Something fundamental is missing in our models.”

Scientists. . 2011.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Margaret Geller — Margaret Joan Geller (* 8. Dezember 1947 in Ithaca, New York, USA) ist eine US amerikanische Astrophysikerin. Inhaltsverzeichnis 1 Leben 2 Veröffentlichungen 3 Preise …   Deutsch Wikipedia

  • Margaret Geller — Margaret Joan Geller (born in 1948) is an American astronomer and professor. She is a Senior Astronomer at the Smithsonian Astrophysical Observatory, and has written numerous articles and produced several award winning scientific short films. Her …   Wikipedia

  • performing arts — arts or skills that require public performance, as acting, singing, or dancing. [1945 50] * * * ▪ 2009 Introduction Music Classical.       The last vestiges of the Cold War seemed to thaw for a moment on Feb. 26, 2008, when the unfamiliar strains …   Universalium

  • Pasajeros a bordo del RMS Titanic — Anexo:Pasajeros a bordo del RMS Titanic Saltar a navegación, búsqueda Esta es una lista de los 2207 pasajeros a bordo del RMS Titanic, golpeado por un iceberg en el océano Atlántico mientras partía a la ciudad de Nueva York, el buque finalmente… …   Wikipedia Español

  • Anexo:Pasajeros a bordo del RMS Titanic — Esta es una lista de los 2207 pasajeros a bordo del RMS Titanic, golpeado por un iceberg en el océano Atlántico mientras se dirigía a la ciudad de Nueva York. Finalmente se hundió. Los nombres en cursiva hacen referencia a aquellas personas que… …   Wikipedia Español

  • REFORM JUDAISM — REFORM JUDAISM, first of the modern interpretations of Judaism to emerge in response to the changed political and cultural conditions brought about by the emancipation . The Reform movement was a bold historical response to the dramatic events of …   Encyclopedia of Judaism

  • Drew Barrymore — Données clés Nom de naissance …   Wikipédia en Français

  • MacArthur Fellows Program — For the award in the field of ecology, see Robert H. MacArthur Award. The MacArthur Fellows Program or MacArthur Fellowship (nicknamed the Genius Award) is an award given by the John D. and Catherine T. MacArthur Foundation each year to typically …   Wikipedia

  • Liste der MacArthur Fellows — Die MacArthur Fellowship ist eine von der John D. und Catherine T. MacArthur Foundation vergebene Auszeichnung, verbunden mit einem fünfjährigen Stipendium. Inhaltsverzeichnis 1 Liste der MacArthur Fellows 1.1 1981 1.2 1982 1.3 …   Deutsch Wikipedia

  • List of California Institute of the Arts people — Lists of notable alumni, faculty, and visiting artist of the California Institute of the Arts.chool of ArtAlumni* Sean Adams (BFA 86, Graphic Design) * Angus Andrew * Edgar Arceneaux * Larissa Banks * Ashley Bickerton * Weston Bingham (MFA 96,… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”