82846
The specific energy of an object such as a meteoroid falling on the earth from outside the earth 's gravitational well is at least one half the square of the escape velocity of 11.2 " km / s .
 astronomical object: meteoroid
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: meteoroid 
Answer:
 astronomical object: meteoroid