There is no one point of origin, or ‘center’, of the expansion. Everywhere is said to be the center. But it is true that objects can drift apart so much that they cannot possibly communicate anymore, even at the speed of light. See “Horizon Problem”. It relates to the Big Bang, and is one of the fundamental problems with the theory.
However, they (certain objects) MAY still communicate within the mysterious realm of quantum physics, where once quantum-entangled particles somehow remain in instantaneous communication with each other despite of the current distance between them. In theory, they can be on opposite ends of the universe. The phenomenon is called non-locality, “spooky action at a distance”(Einstein), EPR thought experiment(Einstein, Podolsky and Rosen), Belle’s Theorem.
“Quantum entanglement occurs when particles such as photons, electrons, molecules as large as buckyballs,[1][2] and even small diamonds[3][4] interact physically and then become separated; the type of interaction is such that each resulting member of a pair is properly described by the same quantum mechanical description (state), which is indefinite in terms of important factors such as position,[5] momentum, spin, polarization, etc.
According to the Copenhagen interpretation of quantum mechanics, their shared state is indefinite until measured.[6] Quantum entanglement is a form of quantum superposition. When a measurement is made and it causes one member of such a pair to take on a definite value (e.g., clockwise spin), the other member of this entangled pair will at any subsequent time[7] be found to have taken the appropriately correlated value (e.g., counterclockwise spin). Thus, there is a correlation between the results of measurements performed on entangled pairs, and this correlation is observed even though the entangled pair may have been separated by arbitrarily large distances.[8]
This behavior is consistent with quantum mechanical theory and has been demonstrated experimentally, and it is accepted by the physics community. However there is some debate[9] about a possible underlying mechanism that enables this correlation to occur even when the separation distance is large. The difference in opinion derives from espousal of various interpretations of quantum mechanics.
Research into quantum entanglement was initiated by a 1935 paper by Albert Einstein, Boris Podolsky, and Nathan Rosen describing the EPR paradox[10] and several papers by Erwin Schrödinger shortly thereafter.[11][12] Although these first studies focused on the counterintuitive properties of entanglement, with the aim of criticizing quantum mechanics, eventually entanglement was verified experimentally,[13] and recognized as a valid, fundamental feature of quantum mechanics. The focus of the research has now changed to its utilization as a resource for communication and computation. ...”
“There are two problems with classical big bang theory. We have the
cosmic background radiation that is even to one part in 10^5. So that
means that every part of the Universe in the past came to an agreement
that every part should have the same temperature at 100,000 years
after the big bang (this is the time when light would be free from
getting gobbled up by ions).
The horizon problem is that the stuff of the Universe was too far
apart from each other to reach such an agreement. The separation was
more than a particle traveling at the speed of light could cover.”
http://www.physicsforums.com/showthread.php?t=168811