89542
In a large body such as a planet , this train could be left to accelerate using just the force of gravity , since during the first half of the trip ( from the point of departure until the middle ) , the downward pull towards the center of gravity would pull it towards the destination .
 astronomical object: planet
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: planet 
Answer:
 astronomical object: planet