The distance from the earth to polaris is approximately 5.78 × 1018 m. the speed of light is 2.99792 × 108 m/s. if the north star polaris were to burn out today, in how many years would it disappear from our vision? answer in units of years.

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted