The of the galaxies prove(s) that the cosmos is not steady and unchanging.
1 doppler shift
2 gravitational rotation
3 recessional motions
4 velocity

explanation:

on august 6, 1945, just days after the potsdam conference ended, the u.s. bomber enola gay dropped the uranium bomb known as “little boy” on the japanese city of hiroshima. despite its devastating effects, japan didn't offer unconditional surrender right away, as the united states had hoped.