17690
Because the half-life of I is comparatively short on a cosmological time scale ( 16 million years ) , this demonstrated that only a short time had passed between the supernova and the time the meteorites had solidified and trapped the I. These two events ( supernova and solidification of gas cloud ) were inferred to have happened during the early history of the Solar System , because the I isotope was likely generated shortly before the Solar System was formed , seeding the solar gas cloud with isotopes from a second source .
 location: I; location: Solar System
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: I, Solar System 
Answer:
 location: I; location: Solar System