60549
The companion could be very dim , so that it is currently undetectable or masked by the glare of its primary , or it could be an object that emits little or no electromagnetic radiation , for example a neutron star .
 neutron star
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:
 neutron star