1038
Stellar activity , rotation periods , star spot evolution , star–planet interactions , multiple star systems are nice extras in addition to the main asteroseismic program .
 astronomical object: multiple star systems
Please list all entity words in the text that fit the category.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} 
Answer:
 astronomical object: multiple star systems