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A-type star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by Balmer absorption lines of hydrogen. Stars of spectral class A are typically blue-white or white in color, measure between 1.4 and 2.1 times the mass of the Sun, and have surface temperatures of 7,600–10,000 kelvin.
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This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results.
With the exception of its white dwarfs, the cluster's central two parsecs (6.5 light-years) contain only star systems of at least 1 M ☉. [1] This tight concentration of heavy stars gives the Hyades its overall structure, with a core defined by bright, closely packed systems and a halo consisting of more widely separated stars in which later ...
A word search, word find, word seek, word sleuth or mystery word puzzle is a word game that consists of the letters of words placed in a grid, which usually has a rectangular or square shape. The objective of this puzzle is to find and mark all the words hidden inside the box.
Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. [1] [2] As one of the founders of the discipline, James Keeler, said, astrophysics "seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space—what they are, rather than where they are", [3] which is studied ...
Wonderword is a word search puzzle, still created by hand, with a solution at the end. All the words in the grid connect and the remaining letters spell out the answer. The puzzles are either in a 15×15 or 20×20 grid. [1] Each puzzle has a title, theme, solution number and wordlist.
The Revival of Planetary Astronomy in Carolingian and Post-Carolingian Europe. Variorum Collected Studies Series. Vol. CS 279. Ashgate. ISBN 0-86078-868-7. Hodson, F. R., ed. (1974). The Place of Astronomy in the Ancient World: A Joint Symposium of the Royal Society and the British Academy. Oxford University Press. ISBN 0-19-725944-8.