Which statements are true? Check all that apply. Line XY contains ray OX and ray OY
Line XY contains segment YX.
o CA and Ac are different segments.
Ray BA exists in the diagram
Ray YX exists in the diagram.

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