... Credit: DMR , COBE , NASA , Four-Year Sky Map Explanation: Our Earth is not at rest. ... The Milky Way Galaxy orbits in the Local Group . ... In the above all-sky map , radiation in the Earth's direction of motion appears blueshifted and hence hotter, while radiation on the opposite side of the sky is redshifted and colder. The map indicates that the Local Group moves at about 600 kilometers per second relative to this primordial radiation . ... Publications with keywords: universe - COBE . ...