20 Jan How is 21cm wavelength li
How is 21cm wavelength light useful to astronomers?
a. It lets astronomers map the large-scale motion and distribution of atomic hydrogen in the Milky Way.
b. It lets astronomers learn about the process of star formation by mapping the distribution of molecular gas.
c. It lets astronomers use distant stars in the Galaxy’s halo because these signals penetrate the dust in the Galaxy’s disk.
d. It lets astronomers see through molecular gas into the Milky Way’s black holes.
If another galaxy has a star that is a similar distance from its center as our sun is in our galaxy (30,000 lightyears), and measure its orbital speed to be similar to that of our sun (125 km/s), how does the mass of that galaxy compare with the mass of our own galaxy?
a. The galaxy’s mass (inside the star’s orbit) is more than that of our Milky Way galaxy.
b. The galaxy’s mass (inside the star’s orbit) is about the same as that of our Milky Way galaxy.
c. The galaxy’s mass (inside the star’s orbit) is less than that of our Milky Way galaxy.
d. Without more information about the mass of the orbiting star, we cannot answer the question
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