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However , in 1962 , John Archibald Wheeler and Robert W. Fuller published a paper showing that this type of wormhole is unstable if it connects two parts of the same universe , and that it will pinch off too quickly for light ( or any particle moving slower than light ) that falls in from one exterior region to make it to the other exterior region .
 person: John Archibald Wheeler; person: Robert W. Fuller
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: John Archibald Wheeler; person: Robert W. Fuller