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The atmospheres of the planets Venus and Mars are primarily composed of carbon dioxide , with small quantities of nitrogen , argon , oxygen and traces of other gases .
 astronomical object: Venus; astronomical object: Mars
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: Venus, Mars 
Answer:
 astronomical object: Venus; astronomical object: Mars