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Space-based solar power " ( " SBSP " ) is the concept of collecting solar power in space ( using an " SPS " , that is , a " solar-power satellite " or a " satellite power system " ) for use on Earth .
 Earth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Earth