Assertion: cosmic ray's source | /r/HasProperty | black holes
Facets:
Source sentences:
text: It is now known that such X-ray sources as Sco X-1 are compact stars, such as neutron stars or black holes.
text: Other sources could be neutron stars, radio galaxies, X-ray binaries (such as Cygnus X-3), active galactic nuclei (AGNs) and black holes.
text: Other sources could be neutron stars, radio galaxies, X-ray binaries (such as Cygnus X-3), active galactic nuclei (AGNs) and black holes.