Pentagon side count

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Possible Answers: FIVE.

Last seen on: LA Times Crossword 21 May 2018, Monday

Random information on the term “FIVE”:

The Messier objects [me.sje] are a set of 110 astronomical objects, of which 103 were included in lists published by French astronomer Charles Messier in 1771 and 1781. Messier was a comet hunter, and was frustrated by objects which resembled but were not comets, so he compiled a list of them, in collaboration with his assistant Pierre Méchain, to avoid wasting time on them. In addition to the 103 items published by Messier, seven more are thought to have been observed by Messier and have been added to the list by other astronomers over the years.


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A shorter list had been published in 1654 by Giovanni Hodierna, but attracted attention only recently and was probably not known to Messier.

The first edition of 1771 covered 45 objects numbered M1 to M45. The total list published by Messier in 1781 contained 103 objects, but the list was expanded through successive additions by other astronomers, motivated by notes in Messier’s and Méchain’s texts indicating that at least one of them knew of the additional objects. The first such addition came from Nicolas Camille Flammarion in 1921, who added Messier 104 after finding a note Messier made in a copy of the 1781 edition of the catalogue. M105 to M107 were added by Helen Sawyer Hogg in 1947, M108 and M109 by Owen Gingerich in 1960, and M110 by Kenneth Glyn Jones in 1967. M102 was observed by Méchain, who communicated his notes to Messier. Méchain later concluded that this object was simply a re-observation of M101, though some sources suggest that the object Méchain observed was the galaxy NGC 5866 and identify that as M102.

FIVE on Wikipedia