The ancient greek geographer ptolemy created a grid system and listed the for places throughout the known world in his book geography. a.. elevations. b.. altitudes. c.. coordinates. d.. meridians.

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