When the absorption lines of a galaxy shift toward the blue end of the spectrum, it means that the galaxy is (a) large and old.( b) small and young.( c)moving away from Earth. (d )moving closer to Earth. Question 7 (1 point)

mistakes are ok

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.