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The scope of the list is still restricted to the main sequence spectral types: M, K, F, G, A, B and O. It may be later expanded to other types, such as S , D or C . The Alpha Centauri star system is the closest star system to the Sun .
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.
The Gliese (later Gliese-Jahreiß) catalogue attempts to list all star systems within 20 parsecs (65 ly) of Earth ordered by right ascension (see the List of nearest stars). Later editions expanded the coverage to 25 parsecs (82 ly). Numbers in the range 1.0–915.0 (Gl numbers) are from the second edition, which was
September. The full Harvest Moon on Sept. 17 signifies the symbolic start of what for many is their favorite season.. October. The first official full moon of the fall, the Hunter’s Moon on Oct ...
List of Solar System objects most distant from the Sun; List of Solar System objects by size; Lists of geological features of the Solar System; List of natural satellites (moons) Lists of small Solar System bodies; Lists of comets; List of meteor showers; Minor planets. List of minor planets. List of exceptional asteroids; List of minor planet ...
Se — Sersic (selected list of peculiar galaxies and groups of galaxies) See — T.J.J. See (Thomas Jefferson Jackson See, 1866–1962) (double stars) (related to the 'Lambda' catalogue which is mentioned in T.W.Webb's Celestial Objects for Common Telescopes, Volume 2: The Stars, pages 285–319: Index of Double Stars, Epoch 2000).
The most influential angelic hierarchy was that put forward by Pseudo-Dionysius the Areopagite in the 5th or 6th century in his book De Coelesti Hierarchia (On the Celestial Hierarchy). Dionysius described nine levels of spiritual beings which he grouped into three orders: [1] [2] [3] Highest orders Seraphim Cherubim Ophanim ; Middle orders
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