74305
At the moment of a large enough meteor or comet impact , bolide detonation , a nuclear fission , thermonuclear fusion , or theoretical antimatter weapon detonation , a flux of so many gamma ray , x-ray , ultraviolet , visual light and heat photons strikes matter in a such brief amount of time ( a great number of high-energy photons , many overlapping in the same physical space ) that all molecules lose their atomic bonds and " fly apart " .
 comet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 comet