Black holes and their astrophysical implications. I

Details Black holes and their astrophysical implications. I Black holes and their astrophysical implications. I

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975s%26t....50...20b&link_type=abstract

Sky and Telescope, vol. 50, July 1975, p. 20-23.

Astronomy and Astrophysics

Astrophysics

Astrophysics, Black Holes (Astronomy), Gravitational Collapse, Relativity, Singularity (Mathematics), Astronomical Models, Earth (Planet), Neutron Stars, Space-Time Functions, Stellar Rotation, Sun

Scientific paper

A general qualitative review of black hole theory is presented. Collapse of a star to its gravitational (Schwarzschild) radius is described, and values of the gravitational radius are computed for the sun, the earth, and a neutron star. Explicit definitions are given for the event horizon, static limit, irreducible mass, and ergosphere of a black hole as well as for the concept of a space-time singularity. The energetic processes and characteristics of rotating and nonrotating black holes are discussed, and energy extraction mechanisms are described, including deflection of a particle through the ergosphere and the collision of two black holes. The optical appearance of a star which is collapsing through its gravitational radius to form a Schwarzschild (nonrotating) black hole is considered.

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