The Milky Way is often considered to be an intermediately wound, barred spiral, which would be type
A) E4.
B) Sa.
C) SBb.
D) SBV.
E) B2S.
C
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The densest, coldest clouds are called _____________
a. reflection nebula b. dark nebula c. Bok globules d. molecular clouds
About how far away from Earth would the Sun be located on this scale?
A) 3.75 meters (about 12 feet) B) 37.5 meters (about the height of a 12-story building) C) 375 meters (about the length of four football fields) D) 37.5 kilometers (the size of a large city)
Explain why galaxy collisions are far more common than star-star collisions.
What will be an ideal response?
Imagine you serve a tennis ball with an initial speed of 10 m/s in a direction 10° below the horizontal. What is its speed at the peak of its trajectory?
A. 10 m/s B. 9.8 m/s C. 1.7 m/s D. 0 m/s E. There is no “peak” to this tennis ball’s trajectory. F. Other (specify)