Indicate whether the following statements are true or false. (Select T-True, F-F
ID: 1606811 • Letter: I
Question
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) Galaxies sometimes collide with each other.
B) It wasn't until the 1920s that we knew the Milky Way was only one of many galaxies.
C) The mass of a spiral galaxy can be found from its rotational velocity. The greater the rotation, the greater the mass.
D) Most galaxies are elliptical.
E) The three main classifications of galaxies are elliptical, spiral and prime.
F) The shorter the pulsation period of a Cepheid variable star, the more luminous it is.
Explanation / Answer
A) Galaxies sometimes collide with each other. - True , yes milky way is merging with sagiritius
B) It wasn't until the 1920s that we knew the Milky Way was only one of many galaxies.- True , Hubble made a big study to identify galaxies beyond milky way.
C) The mass of a spiral galaxy can be found from its rotational velocity. The greater the rotation, the greater the mass., True. The mass inside a given distance from the center = (orbital speed)2 × (distance from the center)/G
D) Most galaxies are elliptical., True
E) The three main classifications of galaxies are elliptical, spiral and prime. False, The three main classifications of galaxies are elliptical, spiral and Irregular
F) The shorter the pulsation period of a Cepheid variable star, the more luminous it is.False, more luminous variables have longer pulsation periods.