See Also: Messier catalog(encyclopedia)
Messier(dictionary)
unsounded(1)(dictionary)
unsounded(2)(dictionary)
Catalog House(money)
card catalog(dictionary)

unsounded(1) (iou) and Messier catalog (sh)


unsounded(1) (iou)



unsounded adjective1. M16.
[from UN-1 + sounded pa. pple of SOUND verb1.]
Not expressed or pronounced; not made to sound.

Messier catalog (sh)




List of about 109 star clusters, nebulae, and galaxies compiled by the French astronomer Charles Messier (1730-1817), who discovered many of them.

Still a valuable guide to amateur astronomers, it was superseded by the New General Catalogue (NGC); both NGC and M Reference numbers remain in common use.