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The evolution of human understanding of comets is also detailed , and thinkers and astronomers such as Edmond Halley , Immanuel Kant , and William Huggins are discussed .
 Edmond Halley, William Huggins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Edmond Halley, William Huggins