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1. Determine the wavelength of the standard 21-cm hydrogen spectral line that we receive from the galaxy described in the preceding problem. Could such a large redshift lead astronomers to mistake this spectral line for another one that has an intrinsically longer wavelength?

2. The largest known redshift attributed to a speci?c molecule is z = 6.42 from the CO molecule in the quasar SDSS J1148+5251. Find the quasar's distance from us and recession speed relative to us.

3. One of the largest observed redshifts for a galaxy is 8.6 from the galaxy UDFy-38135539. How fast is the galaxy moving with respect to us? How far away is it?

4. (a) Research the different types of supernova and explain why Types Ia, Ib, and Ic are labeled differently.

(b) Why do Types Ib, Ic, and II have more in common with each other than with Type Ia?

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