Convection is the process in which heat is carried by parcels of moving fluid.
For example, heating a pan of water causes the lowermost layer of fluid to expand and become less dense, making it rise and carry its heat upward. Upcoming article in Physical Review Letters . For example, big blobs in the CMB map imply a large value for omega, which in turn suggests the universe will collapse. Small blobs imply a smaller omega and an expanding universe. Higher resolution samplings of tiny portions of the CMB, such as that made with the Saskatoon detector in northern Canada, observe blobs at a size that stands midway between that corresponding to an open and shut universe.