80838
As they move , the wavelength of their light becomes longer , through the Doppler effect , and shifts toward red , or even becomes invisible .
 person: Doppler
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: Doppler 
Answer:
 person: Doppler