Me has hecho dudar y todo! Pero sacado de Wordreference: a kilometre or so, un kilómetro más o menos
Y de otro site: Adv. 1. or so - (of quantities) imprecise but fairly close to correct; "lasted approximately an hour"; "in just about a minute"; "he's about 30 years old"; "I've had about all I can stand"; "we meet about once a month"; "some forty people came"; "weighs around a hundred pounds"; "roughly $3,000"; "holds 3 gallons, more or less"; "20 or so people were at the party"
Además he escuchado en podcast y dejan claro que es un número aproximado de galaxias por mundo y no que sea el mínimo.
Edito: El traductor de google es una mierda, significa más o menos, cabezón!!