Chapter 25 Questions And Answers – Flashcards

The more massive a galaxy is, (a) the more distant it is; (b) the faster star formation in it occurs; (e) the larger the proportion of old stars it contains; (d) the faster it rotates.

A galaxy containing substantial amounts of dark matter will (a) appear darker; (b) spin faster; (c) repel other galaxies; (d) have more tightly wound arms.

According to X-ray observations, the space between galaxies in a galactic cluster is (a) completely devoid of matter; (b) very cold; (c) very hot; (d) filled with faint stars.

Relative to luminous stellar matter, the fraction of dark matter in clusters is (a) greater than the fraction in galaxies; (b) less than the fraction in galaxies; (e) the same as the fraction in galaxies; (d) unknown.

Galaxies evolve by (a) fragmenting into smaller galaxies; (b) merging to fonn larger galaxies; (e) ejecting their gas and dust into intergalactic space; (d) using up all their gas and etn tnally becoming ellipticals .

According to current theories of galactic evolution, quasars occur (a) early in the evolutionary sequence; (b) near the Milky Way; (e) when elliptical galaxies merge; (d) late in the evolutionary sequence.

Many nearby galaxies (a) will become black holes; (b) contain quasars; (e) have radio lobes; (d) were more active in the past.