80227
However , radio telescopes have also been used to investigate objects much closer to home , including observations of the Sun and solar activity , and radar mapping of the planets .
 Sun
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:
 Sun