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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What is the change in the pressure?
A. 371 Pa B. 323 Pa C. 301 Pa D. 298 Pa E. 273 Pa
About how many stars has the Hipparcos mission given us accurate distance data on?
A) about 3,000, about half of what you can see with the naked eye alone B) over 6000, the visible naked eye stars and some seen in binoculars C) 60,000, those within about 100 light years of us D) a million, those with parallaxes of .005" or larger E) over 100 billion, almost every star in the galaxy
A body on the surface of the Earth weighs 400 lb. The radius of the Earth is about 4,000 miles. If this same body were placed on a 4,000-mile high tower, its weight would be 200 lb
a. True b. False Indicate whether the statement is true or false
An altocumulus cloud belongs to which cloud family?
a. Low b. Clouds of vertical development c. High d. Middle