50129
They may similarly be produced in regions like the center of the Milky Way and other galaxies , where very energetic celestial events occur ( principally the interaction of relativistic jets with the interstellar medium ) .
 Milky Way
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:
 Milky Way