gravitationally bound collection of a large number of stars term used to describ

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gravitationally bound collection of a large number of stars term used to describe the mass in galaxies and clusters whose existence we infer from rotation curves and other techniques, but that has been confirmed by observations at any electromagnetic wavelength a star whose luminosity changes with time a relation between the pulsation period of a Cepheid variable and its absolute brightness usually refers to young, heavy element rich, disk stars usually refers to old, heavy element poor, halo stars galaxy period- luminosity relation dark matter variable star population I population II

Explanation / Answer

1 a

2 c

3 d

4 b

5 e

6 f

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