Quarks to Cosmos Lecture Sheet 14

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Black Holes

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11 Terms

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What happens when neutron degeneracy fails?

Collapse to a black hole.

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What is the Schwarzschild radius?

Radius of event horizon.

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Schwarzschild radius of Earth & Sun?

Earth ~9 mm; Sun ~3 km.

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What is gravitational redshift?

Light loses energy escaping gravity → redshift.

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What do we see as object falls in?

Appears to freeze and redshift at horizon.

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Cygnus X-1?

First strong stellar black-hole candidate.

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What is LIGO?

Gravitational wave detector.

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GW170817?

First neutron star merger detected in gravitational waves.

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If Jupiter becomes BH, what changes?

Nothing about orbits; same mass → same gravity.

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Types of black holes?

Stellar, Intermediate, Supermassive.

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Sgr A*?

Supermassive black hole at Milky Way center.