I understand that the Wilkinson Microwave Anisotropy Probe has made observations of the angular size of early fluctuations in the Cosmic microwave background. As the observed angular size is the same as the expected angular size it seems that light travelling to us from those early fluctuations has not been distorted. Thus it has been concluded that the intervening space must be nearly flat. But what about space-time? If light beams from the edges of an early fluctuation passed either side of an accelerating region of space then I assume that those beams would be deflected leading to a different observed angular size. Thus it seems to me that the WMAP observations carry the stronger implication that space-time is flat as well (or equivalently that the Universal expansion has not been accelerating while the light from early CMB fluctuations have been travelling to us).