4974
the eagle two will sit on the surface of mars for about six months , if all goes well , it will dig around , probe around , anize rocks and search for signs of water .
 the eagle two, it, the surface of mars, mars
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:
 the eagle two, it, the surface of mars, mars