Normal elliptical galaxies contain many low mass stars. many high mass stars. a

Question

Normal elliptical galaxies contain many low mass stars. many high mass stars. a large amount of interstellar matter. many Hll regions. I I and II III I, II and IV all of I, II, III, IV Which of the following is true about the formation of the elements? Hydrogen is formed in the centres of stars. Iron is produced during the formation of planetary nebulae. Elements heavier than iron are produced in supernova explosions. Oxygen is formed in the Big Bang. I and II I, II and III II and III III all of I, II, III IV Cepheid variable stars are main sequence stars. change their radii periodically. are very bright follow a Period-Luminosity relationship. I and II I, III and IV IV II, IIII and IV all of I, II, III, IV Dark energy causes the expansion of the Universe to accelerate. was first found from observations of distant supernovae. makes up 99.9% of the mass/energy of the Universe. can be used to estimate the distance to galaxies. I and II I, II and III II and III I, II and IV all of I, II, III, IV Besides the Earth other places in our Solar System where we think there may be liquid water include: under the surface of Mars. under the surface of Europa. on the surface of Titan. on the surface of Venus. I and II I, II and III II and III I, II, and IV all of I, II, III, IV

Explanation / Answer

16) I. many low mass stas. Because the diving force for elliptical galaxies here is mergers of smaller galaxies and a supermassive black hole is existed at the center. So most of the elliptical galaxies are composed of older, low-mass stars, with a sparse interstellar medium and minimal star formation activity.

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