History
1.1 General relativity
1.2 Golden age
2 Properties and structure
2.1 Physical properties
2.2 Event horizon
2.3 Singularity
2.4 Photon sphere
2.5 Ergosphere
3 Formation and evolution
3.1 Gravitational collapse
3.2 High-energy collisions
3.3 Growth
3.4 Evaporation
4 Observational evidence
4.1 Accretion of matter
4.2 X-ray binaries
4.3 Galactic nuclei
4.4 Effects of strong gravity
4.5 Alternatives
5 Open questions
5.1 Entropy and thermodynamics
5.2 Information loss paradox
6 See also
7 Notes
8 References
9 Further reading
10 External links