A new technology can directly measure the expansion rate of the universe with stars.

The biggest challenge of cosmic expansion measurement is that many methods we use rely on models. One of the most famous examples is the use of distant supernovae. We compare the standard brightness of type Ia supernovae with their viewpoint brightness to calculate their distance. But we know that the standard brightness depends on the comparison between their brightness and jujube rich variable stars, which are determined by measuring the distance of nearby stars through parallax. Every step in space depends on the steps ahead.

In recent years, our methods of measuring the expansion of the universe are obviously not completely consistent, so either the systematic error has quietly infiltrated our data or there is something wrong with the universe model. It is said that chaos method is to find a new way to measure the expansion of the universe. What has nothing to do with the model data is also a breakthrough. We have made great progress in this regard. The phenomenon of astronomical maser and gravitational wave shows a huge Hill effect. In a recent study by PhysicalReview A, a method aimed at young people and gravity lenses was proposed.

Stars are very bright and distant objects. Their strength comes from supermassive black holes active in young galaxies. The light we see in the stars takes billions of years to reach the earth, so the expansion of the universe during this time leads to the red shift. This new method does not try to measure the distance between these stars, but focuses on the gravity of nearby galaxies.

The idea behind this new job is simple. By comparing the red shift of the lens star images near the Milky Way, we can know how much the universe has expanded in ten or one hundred years. Dealing with galaxies with different distances in this way can not only determine the speed of the expansion of the universe, but also determine that this speed is exaggerating the time change.

In fact, it is very difficult to compare these redshifts. There is almost no red shift difference between these two star images, because light travels far and its spectral line is blurred by the gas that reaches it. This is called Doppler amplification effect. So you can't compare the red shift directly.

There is a method that can provide us with a detailed method of the expansion and evolution of the universe, and can also solve the contradiction in modern cosmology. The next thing to do is to make a detector for the ground telescope to make such a measurement.