What is this galaxy doing that keeps it from being idle?
A: The black hole at the center of the disk is sucking in the stars in the disk, which is gradually disappearing.
B: It is fragmenting into different irregular parts as the universe evolves.
C: It is oscillating between compressed and rarefied states, changing by a factor of two in size every million years.
D: Stars are forming in the spiral arms and the disk is rotating.
E: The galaxy evaporates quickly so that it will only be around for another million years.
Ans: D: Stars are forming in the spiral arms and the disk is rotating.
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An altocumulus cloud belongs to which cloud family?
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About how many stars has the Hipparcos mission given us accurate distance data on?
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a. True b. False Indicate whether the statement is true or false