A parsec is a standard astronomical measurement that is often misunderstood. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A parsec is a unit ...

THE DISTRIBUTION OF THE STARS IN SPACE.—The “Astrophysteal Journal for July contains an important paper by Prof. Kapteyn and P. J. Van Rhijn on stardensity in different regions of the stellar system.