Quarks to Cosmos Lecture Sheet 15

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Galaxies & Dark Matter

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10 Terms

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What is a spiral nebula?

Old word for galaxy.

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Herschel’s model?

Milky Way map via star counts.

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Cepheid variable?

Pulsating star with period-luminosity law.

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How to calibrate Cepheids?

Distances to nearby Cepheids.

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Who proposed dark matter?

Zwicky.

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Who confirmed via rotation curves?

Vera Rubin.

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Three DM evidence lines?

Rotation curves, lensing, cluster dynamics.

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Bullet Cluster?

Shows DM separated from gas after collision.

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Why DM isn’t ordinary matter?

Doesn’t emit/absorb/scatter light.

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MACHO vs WIMP?

MACHO = compact; WIMP = particle.