The gap between the expansion speed measured by NASA’s new James Webb space telescope and the “theoretical” value deduced from the standard model has even increased.
You probably already know: the Universe is not static, but expanding. He grows up. It was an American astronomer, Edwin Hubble, who was the first to notice this, in 1929, when he saw that the galaxies around us were escaping, and all the more quickly the further they were from us. A parameter called the Hubble constant characterizes this relationship between distance and escape velocity. But there is a major problem: its value is not the same depending on the method we use to measure it.
About ten years ago, the European satellite Planck revealed the most precise map ever made of the cosmic microwave background, the first light which propagated in the Universe 380,000 years after the big bang. The study of its fine structure and its properties makes it possible to deduce, through calculation, the current speed of expansion, called H0. However, this value turned out to be slightly smaller than that measured by directly studying the “leak”…
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