Space.com are running a short interview with Lawrence Krauss, theoretical physicist and co-author of an upcoming paper in The Journal of Relativity and Gravitation in which it is claimed that billions of years in the future our descendents will no longer be able to study cosmology.
Without a cosmological frame of reference, Krauss explained, future observers will be clueless that their universe is still expanding. "It will be a sort of twisted situation, where thinking returns to what it was at the turn of the 20th century," he said. In other words, observers will think the universe is just a static--or non-expanding--cluster of galaxies just as scientists thought until the 1920s. "The static universe," as the journal article states, "will have returned with a vengeance."