Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars.
B) Most galaxies appear to be approaching the Milky Way Galaxy.
C) Irregular galaxies rarely have star formation taking place in them.
D) Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way.
E) Galaxy collisions destroy most of the stars in the galaxies involved.
Ans: D) Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way.
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The brightest main-sequence star in a cluster has a surface temperature of 30,000 K and a luminosity of about 104 LSun. Referring to the figure above as needed, what is the approximate age of the cluster?
A) 107 years B) 109 years C) 1011 years D) 1013 years
Which will win the race to the bottom of the incline: a hoop, or a disk with the same mass and radius?
A. the hoop B. the disk C. they will both reach the bottom at the same time
The fastest moving planet in a solar system is the
A) smallest planet. B) most massive planet. C) planet nearest the Sun. D) planet farthest from the Sun. E) all move at the same speed.
The thermal motions of the atoms in a gas cloud can make it collapse to form a protostar
a. True b. False Indicate whether the statement is true or false