84073
Over the course of an orbital period , the obliquity usually does not change considerably , and the orientation of the axis remains the same relative to the background of stars .
 astronomical object: stars
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: stars 
Answer:
 astronomical object: stars