NGC 7006 (also known asCaldwell 42) is aglobular cluster[2] in theconstellationDelphinus. NGC 7006 resides in the outskirts of theMilky Way. It is about 135,000[6] light-years away, five times the distance between the Sun and the centre of the galaxy, and it is part of thegalactic halo. This roughly spherical region of the Milky Way is made up of dark matter, gas and sparsely distributed stellar clusters.
NGC 7006 appears in the science fiction novelBeyond the Farthest Star byEdgar Rice Burroughs, where it is used as a point of reference by the inhabitants of the planet Poloda to determine the approximate location ofEarth.[7]
^Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters",Harvard College Observatory Bulletin,849 (849):11–14,Bibcode:1927BHarO.849...11S