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Alpha Centauri , the closest star system to the Sun , has a high proper motion ; it will be a mere half-degree from Beta Centauri in approximately 4000 years .
 astronomical object: Alpha Centauri; astronomical object: Beta Centauri
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: Alpha Centauri, Beta Centauri 
Answer:
 astronomical object: Alpha Centauri; astronomical object: Beta Centauri