1. A distant galaxy has a redshift of 0.05. If the Hubble constant is 68 (km/s)/Mpc, how far away is this galaxy? O 3.4 Mpc O 68 Mpc O 220 Mpc 340 Mpc O 1360 Mpc O not enough information to determine 2. The gravitational acceleration felt by a spaceship just outside the event horizon of a 10 Mo black hole is F. What acceleration would the spaceship experience if it were moved just outside the event horizon of a black hole with twice that mass? O X F O 12 F O O 4 F 8 F OO O not enough information to determine2. A galaxy emits 21 cm radio waves at a time corresponding to a redshift today of z=3. If an observer at the time corresponding today to redshift z=1 looked at that radiation, what wavelength would she measure? (O 21cm (O 315cm @ 42cm () 63 cm () 84 cm (O) none of the above