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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 .
 person: Edmond Halley; person: William Huggins
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Edmond Halley, William Huggins 
Answer:
 person: Edmond Halley; person: William Huggins