There is no such thing. The "speed" depends on how far apart the points are.sjordannc said:the speed at which points in space were moving apart from one another
The problem with this is that Hubble's law says that the recession speed is proportional to distance. So we can tell you the Hubble parameter back then, or we can tell you the recession speed of points a specific distance apart, but there is no single recession velocity. Not then and not now.sjordannc said:I'm looking for the speed at which points in space were moving apart from one another
The CMB, or cosmic microwave background, is a faint glow of radiation that permeates the entire universe. It is the oldest light in the universe, dating back to about 380,000 years after the Big Bang.
The expansion speed at the time of the CMB is measured using a variety of techniques, including observations of the CMB itself, the study of the large-scale structure of the universe, and the measurement of the Hubble constant.
The expansion speed at the time of the CMB is estimated to be about 68 kilometers per second per megaparsec. This means that for every megaparsec (3.26 million light years) of distance, the universe was expanding at a rate of 68 kilometers per second.
Yes, the expansion speed at the time of the CMB has changed over time. It has been slowing down due to the gravitational pull of matter in the universe, but in the last few billion years, it has started to accelerate due to the mysterious force known as dark energy.
The expansion speed at the time of the CMB is important because it provides insight into the early stages of the universe and how it has evolved over time. It also helps us understand the nature of dark energy and the fate of the universe. Additionally, it can be used to test and refine our current models of the universe's expansion and evolution.