Ever since scientists created the Big Bang Theory, using the universe expansion speed as part of the way our galaxy was created, they have studied the stars and other heavenly bodies as they travel to figure out more about this phenomenon. Now, a recent study has revealed that the universe expansion speed could be happening differently than previously thought.
Supernova Reveal Slower Universe Expansion Speed
Astronomers at the University of Arizona, led by Peter A. Milne, an astronomer, have determined that supernova, exploding stars, are much more varied than they once believed. According to reports printed in the Astrophysical Journal, this fact led the scientists to figure out that the universe expansion speed could be slower than they thought possible.
In the past, scientists used the supernovae exploding stars to act as a cosmic beacon to help determine the size and depth of our universe. It has been believed in the past that the speed at which the light from these stars reached Earth was consistent. However, now they know that their original conclusions were false, as these stars actually vary in their intenseness and are not all the same.
Dark Energy Applies Force onto Universe Expansion Rate
Part of these new studies add to the belief that something called dark energy is pulling apart the universe. The studies showed that some supernova stars were less intense and had moved further from the Earth than the scientists predicted, which showed that the universe expansion speed was decreasing and that something such as the dark energy was the cause. In fact, it could also mean that there is much less dark energy in the universe as previously thought, which according to previous studies was around 73 percent.
The data for this information on the universe expansion speed came from NASA’s Swift satellite, which has a mission to study gamma ray bursts in space as it makes its travel in orbit around the Earth.
Star Data Will Be Reexamined
The new data has caused the scientists to place the supernova exploding stars into two categories: one where the star is a minority and near to the Earth and one where it is further away and in the majority. They studied data showing the types of light coming from the supernovas in both visible and ultraviolet settings and compared the information they found.
These stars were used to measure the distance in the universe as to their location when they exploded and so were mileposts for past astronomers in measuring the universe expansion speed. Since they are not all alike as thought, this shows that the universe expansion speed could be slower than was believed. Now, based on this new discovery, the data from the existing supernova in the universe must be recalculated to determine the universe expansion speed as the stars travel around in space.