Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars.
B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature.
C) Galaxy collisions destroy most of the stars in the galaxies involved.
D) Irregular galaxies rarely have star formation taking place in them.
E) Most galaxies appear to be approaching the Milky Way Galaxy.
Answer: B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature.
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Which are places on Earth where convection is operating on a grand scale, creating conditions important to life on Earth?
A) in the mantle B) in hot springs like Old Faithful C) in the troposphere, such as a summer thunderstorm D) at the thermal vents in the rift valleys E) All of the above are good examples.
Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:
A) bluer. B) brighter. C) redder. D) larger. E) to have a higher radial velocity.
A very lightweight horizontal loop of wire is suspended from a fine spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to
A) stretch. B) contract. C) stay the same.
Where does the 21-cm radiation arise?
What will be an ideal response?