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the bigger issue is once we get there , we can ' t carry oxygen or water or food to stay there three years , so we ' re going to have to do all of that on the surface of the planet .
 we, we, we, there, there, the surface of the planet, the planet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 we, we, we, there, there, the surface of the planet, the planet