Galaxy cluster

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Possible Answers: APPS.

Last seen on: Newsday.com Crossword – Jul 7 2018

Random information on the term “Galaxy cluster”:

The Abell catalog of rich clusters of galaxies is an all-sky catalog of 4,073 rich galaxy clusters of nominal redshift z ≤ 0.2. This catalog supplements a revision of George O. Abell’s original “Northern Survey” of 1958, which had only 2,712 clusters, with a further 1,361 clusters – the “Southern Survey” of 1989, published after Abell’s death by co-authors Harold G. Corwin and Ronald P. Olowin from those parts of the south celestial hemisphere that had been omitted from the earlier survey.

The Abell catalog, and especially its clusters, are of interest to amateur astronomers as challenge objects to be viewed in dark locations on large aperture amateur telescopes.

The original catalog of 2,712 rich clusters of galaxies was published in 1958 by George O. Abell (1927–1983),[2] who was then studying at the California Institute of Technology. The catalog, which formed part of Abell’s PhD thesis, was prepared by means of a visual inspection of the red 103a-E plates of the Palomar Sky Survey (POSS), for which Abell was one of the principal observers. A. G. Wilson, another of the principal observers, assisted Abell in the initial stages of the survey by routinely inspecting the plates as they were produced. After the completion of the survey, Abell went over the plates again and carried out a more detailed inspection. In both cases inspection was made with a 3.5× magnifying lens.

Galaxy cluster on Wikipedia

Random information on the term “APPS”:

An application software (app or application for short) is computer software designed to perform a group of coordinated functions, tasks, or activities for the benefit of the user. Examples of an application include a word processor, a spreadsheet, an accounting application, a web browser, a media player, an aeronautical flight simulator, a console game or a photo editor. The collective noun application software refers to all applications collectively.[1] This contrasts with system software, which is mainly involved with running the computer.

Applications may be bundled with the computer and its system software or published separately, and may be coded as proprietary, open-source or university projects.[2] Apps built for mobile platforms are called mobile apps.

In information technology, an application is a computer program designed to help people perform an activity. An application thus differs from an operating system (which runs a computer), a utility (which performs maintenance or general-purpose chores), and a programming tool (with which computer programs are created)[original research?]. Depending on the activity for which it was designed, an application can manipulate text, numbers, graphics, or a combination of these elements. Some application packages focus on a single task, such as word processing; others, called integrated software include several applications.[3]

APPS on Wikipedia