Columbia subject headings:
Astrophysics.
Black holes (Astronomy)
Cosmology.
General relativity (Physics)
Harvard subject headings:
Astrophysics
Black holes (Astronomy)
Cosmology.
General relativity (Physics)
Relativistic astrophysics.
Princeton subject headings:
Astrophysics.
Black holes (Astronomy)
Cosmology.
General relativity (Physics)