7994
Direct imaging with the Hubble Space Telescope shows extensive dust clouds out to a radius of around 2000 " AU from the star , corresponding with a stream of fine dust ( composed of grains 5 " nm in diameter ) associated with the star 's stellar wind and coarser dust ( composed of grains with a diameter of around 0.14 " µm ) ejected periodically .
 None
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:  
Answer:
 None