The spectrum of which of the following objects will show a blueshift? a. an object moving just eastward on the celestial sphere, b. an object moving just northward on the celestial sphere, c. an...

The spectrum of which of the following objects will show a blueshift? a. an object moving just eastward on the celestial sphere, b. an object moving just northward on the celestial sphere, c. an object moving directly toward Earth, d. an object moving directly away from Earth, e. an object that is not moving relative to Earth