What is the primary way in which we determine the mass distribution of a spiral galaxy?
A) We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy's center.
B) We calculate its mass-to-light ratio.
C) We apply Newton's version of Kepler's third law to the orbits of globular clusters in the galaxy's halo.
D) We count the number of stars we can see at different distances from the galaxy's center.
A) We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy's center.
You might also like to view...
Standing Sound Waves: A standing wave of the third overtone is induced in a 1.2-m pipe that is open at one end and closed at the other end. The speed of sound in the pipe is 340 m/s. (a) How many antinodes are there in the standing wave pattern?(b) What is the frequency of the sound produced by the pipe in this situation?
Fill in the blank(s) with the appropriate word(s).
The younger the universe was, the more abundant quasars were, according to our deep surveys
Indicate whether the statement is true or false
If you had limited funds to build a large telescope, which type would you choose, a refractor or a reflector? Why?
What will be an ideal response?
Kepler's first law states that Earth's orbit around the Sun takes the shape of a(n) ______________
Fill in the blank(s) with correct word