Which analogy below fits best with our observations of how the spiral arms of ou
ID: 118173 • Letter: W
Question
Which analogy below fits best with our observations of how the spiral arms of our galaxy behave?
Question 15 options:
Like a pinwheel where the spiral arms are fixed and the whole galaxy spins like a solid disk
Like stirring syrup into a thick pudding where the center spins faster (as if stirred by a spoon) and the spiral arms will get wound up tighter and tighter
Like cars on a highway during rush hour traffic where one car brakes briefly for whatever reason, then moves on, but forced the car behind it to break before that one moved on, which, in turn, forced the car behind the second car to break, and so on
Like a rotary lawn sprinkler where the fresh, glowing, gaseous matter is expelled radially from the center but appears to lag more and more the further outward it moves because it has no more rotational source of energy that would speed it up enough to keep up with the rotating center
Explanation / Answer
ANSWER is A : Like a pinwheel where the spiral arms are fixed and the whole galaxy spins like a solid disk
EXPLANATION :
The spiral arms are curved extensions that begin at the bulge of a spiral galaxy, giving it a "pinwheel" appearance. Spiral arms contain a lot of gas and dust as well as young blue stars. Spiral arms are found only in spiral galaxies.
Spiral arms are contain gas and dust as well as young blue stars extending from the center of a galaxy giving a pinwheel appearance. They are curved extensions that begin at the bulge of a spiral galaxy.
Stars will move through the spiral arms and are closer as they pass through. Our own galaxy would appear as a flattened disk with a central bulge and spiral arms...
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