Compare the way an optical and radio astronomer would map the Galaxy
What will be an ideal response?
Optical astronomers try to map the distributions of visible associations of hot, young OB stars, emission nebulae, and open star clusters when visible in the disk. To get around the dust, radio observers use the 21-cm waves from neutral hydrogen, which can be observed and located all over the Galaxy.
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____________________ are groups of 100,000 to 1,000,000 population II stars firmly bound by gravity
Fill in the blank(s) with correct word
For the wave described by 
, determine the first positive x coordinate where y is a maximum when t = 0.
A. 16 m B. 8 m C. 4 m D. 2 m E. 13 m
The unit of capacitance, the farad, is dimensionally equivalent to which of the following?
a. V/C b. V?C c. J/V d. C/V
Four point charges, each of charge 2.5 x 10-5, are located on the x- and y-axes, one at each of the locations (0, 2.0 m), (0, -2.0 m), (2.0 m, 0), and (-2.0 m, 0). The potential at the origin is
A) 2.3 × 105 V. B) 4.5 × 105 V. C) 3.5 × 105 V. D) 1.1 × 105 V. E) 0.