Assertion: gamma ray's source | /r/HasProperty | billions of light years
Facets:
value: away from earth
type: LOCATION
Source sentences:
text: The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years).