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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.
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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.
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.
There's no "i" in answer, but there is a "we" — so let us help you solve today's Wordle puzzle. Before diving into the hints and solutions for the Friday, Jan. 31 puzzle, though, let’s go over ...
A word search. 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. The words may be placed horizontally, vertically, or ...
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.
Mauna Kea in Hawaii is one of the world's premier observatory sites. Pictured is the W. M. Keck Observatory, an optical interferometer.. The following outline is provided as an overview of and topical guide to astronomy: