2024-04-18 15:06:47
The gap between the rate of expansion measured by NASA’s new James Webb Space Telescope and the “theoretical” value derived from the Standard Model has even widened.
You probably already know this: 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 the faster the farther they were from us. A parameter called the Hubble constant characterizes this relationship between distance and escape velocity. But there is a big problem: the 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 that propagated in the universe 380,000 years after the big bang. The study of its fine structure and its properties make it possible to derive, through calculation, the current rate of expansion, called H0. However, this value turned out to be slightly less than that measured by directly studying the “leak” …
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