How fast the universe is expanding from the beginning till now? The Scientists couldn't yet find the answer.
The universe is constantly expanding since the Big Bang, but at what speed, Scientists couldn't assess it yet. But it is essential to know the vastness of the universe first. According to scientists, the farthest visible areas of the universe are almost 46 billion light years away from us, but this is an assumption. The universe has been expanding since its inception 3.8 billion years ago. Astronomers have tried to use the Hubble Constant for this measurement. This measurement is done in two ways. In the first method, we see how much the nearest galaxy is getting away from us, while in the second method, Cosmic Microwave Background (CBM) is used. CMB is microwave radiation that fills all the space in the observable universe. This is the first light emitted at the time of the Big Bang. Experts can observe this light even today, but the light that is away from us due to the distant parts of the universe has spread in the form of radio waves. These radio signals were discovered for the first time in 1960. It provides us one of the prime visions for understanding the reality of the universe.
If the universe is expanding faster than our assumptions, it is younger than its existing age 13.8 billion years. It means if the Standard Model of Cosmology measures how fast the universe expands is not 100% correct, then the models of the universe made are not precise. Despite shortcomings, the Standard Model of Cosmology remains the most successful and well-supported model of cosmology to date. It provides a robust framework for understanding the large-scale structure and evolution of the universe, and many of its predictions have been confirmed by observational data. However, it is likely that refinements or modifications to the model will be necessary as new data is collected and our understanding of the universe advances.
.png "What is expansion theory?")
According to Freedman, this problem will be solved in a few years with a sequence. There are a lot of things that are becoming visible now and will make the precision better with the help of which we can do precise measurements. "Gaia" is the space station of the European Space Agency which was launched in 2013, It measures the positions of nearly a billion stars almost correctly. Scientists use this to measure stars' distances with the help of a technique called "Parallax". Scientists will be able to work better by studying celestial bodies in their orbits at different times during the year which helps to assess how fast the stars are getting away from our Solar System. According to experts, dark energy will evolve with time. The force responsible for the accelerated expansion of the universe is "dark energy". Dark Energy is believed to be a form of energy that permeates space and exerts negative pressure. This negative pressure counteracts gravity's attractive force, causing the universe's expansion to accelerate. However, the true nature of dark energy remains one of the most significant unsolved mysteries in modern cosmology. Therefore, scientists have to dream of new theories that can explain how fast the universe is expanding.