Long Description of Sighting Report

I went out to smoke a cig. Looked up and saw a silver disc shaped ufo partly going into what appeared to be a hole in the sky. It moved very slowly and was being swallowed into the hole. It was like the sky opened up because the stars were not in there place. They were warped somewhat and as it finally went through, which took a few seconds, the sky closed behind it and they stars went back to thier original position. Never seen a ufo do this before.