3. [4pt] Indicate whether the following statements are true or false. (Select T-

Question

3. [4pt] Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF A) The mass of a spiral galaxy can be found from its ro- tational velocity. The greater the rotation, the greater the mass B) The shorter the pulsation period of a Cepheid variable star, the more luminous it is. C) Most galaxies are elliptical D) The three main classifications of galaxies are elliptical Spiral and prime. E) Galaxies sometimes collide with each other F) It wasn't until the 1920s that we knew the Milky Way was only one of many galaxies

Explanation / Answer

A) False,

because the mass of the galaxies are found from the orbital motion of their star. Stars in a more massive galaxy will orbit faster than those in a lower mass galaxy beacuse the greater gravity force of massive galaxy will cause larger accelerations of its stars.

B)- True

Cepheid variables are very luminous stars ,500 to 300000 times greater than the sun , with short periods of change that range from 1 to 100 days.

C)- True

D)- False

because the three classification of galaxies are elliptical, spiral and irregular.

E)- True

it is very common for galaxies to collide and interact with other galaxies.

F)- True

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