After new measurements of the speed of its expansion .. the universe is becoming more mysterious

Shady Abdel Hafez

A research team from the University of Chicago, in cooperation with the US space agency, has been able to apply a new monitoring mechanism to measure the value of the acceleration of cosmic expansion, which appears to be different from all previous values, which again raises a critical question about the accuracy of the theories that explain the nature of the universe.

The universe expands
To understand the idea of ​​cosmic expansion imagine that you brought a balloon and drew several points adjacent to the red, for example, then blow the balloon, here the points will move away from each other, but do not do so because it is moving already, but because the balloon itself swells.

We can look at the universe that way. The American astronomer Edwin Hubble in the 1920s could prove that galaxies are moving away from each other at tremendous speeds because the universe itself - like a balloon - swells or expands.

The so-called "constant Hubble" is the value that expresses this expansion, so the measurement of this constant accurately is a milestone to determine the history of the universe and its future development and nature of work, and without accurate value physicists enter into a great confusion.

Conflicting results
According to the new study, which was recently accepted for publication in the journal Astrophysical Journal, the value of the new Hubble constant is 70 kilometers per second per megabarsk (PARCEC equals 3.26 light years).

To achieve these results, the University of Chicago team used a kind of star called the Red Giants, one of the stages of stars such as the Sun. It swells to the size of a basketball, the size of a pea, and turns red.

Because of their magnification, these stars become more bright, and the Hubble telescope, which is involved in that mission, can capture light proportions in galaxies far away from us.

But the new results contrast with results that emerged several years ago to another Hubble telescope group that says the universe's expansion rate is 74 kilometers per second for each megaparsk. The other Hubble team used a kind of star called the "Keffian Variables," a kind of star that changes in size - And thus how much light it produces - at regular rates.

In 2001, a research team at the University of Chicago used the same kind of variable stars to measure the expansion of the universe. Their program concluded that the Hubble constant value was 72 kilometers per second per megabarsk.

When researchers from NASA used a recent test of radiation from the Big Bang, "the cosmic background radiation," the results came to say that the Hubble constant is 67.4 kilometers per second per megabarsk.

New theory
This discrepancy points to the existence of something mysterious that physicists do not yet know. The error here is not due to the accuracy of the measurements, but rather to the fact that the models used by scientists to describe the expansion of the universe are incorrect. This means that we need other new models to explain this type of contradiction.

The research team at the University of Chicago hopes that these findings will enrich contemporary research in cosmology. Although they differ with other results, the accuracy of each of these measurements opens the door to ideas outside the box that may one day be able to better explain the nature of the universe.