It is a short story that was collected in the book Gold.
Plot Summary[]
Professor Firebrenner was explaining to Mr. Atkins about the nature of time and it's existence in the universe. He was claiming that he could make a small part of the universe frozen in time while the remaining part still temporally normal. He would do so by the means of a space ship named 2217 Glennfusion. He would take themselves to 22.7 million years in future to see the fate of a star that would become a red dwarf. He further assured Mr. Atkins that while they would be busy observing the red dwarf, no time would have elapsed on earth and sun. But when they returned from the trip, solar system was nowhere to be found. Somehow, when they had just figured out that their time travel had created an instability that made the earth and the sun move afar, a Big Bang occured and obliterated them and created another Universe that began to expand.