Most of the masses in the universe consist of a kind of matter that none of us has ever seen. This is called "dark matter" and, despite being incredibly rich, it is also extremely difficult to study. The calculations of the past decades have shown that there are more dark matter around the younger galaxies than the ancient ones from the early days of the universe, but where does the dark matter come from today? The new study offers an answer.
Previous research has shown that the galaxies we see nearby have darker substances than those that are far apart. The distant galaxy in the past, we are actually looking at, and scientists believed that these ancient galaxies did not have so much dark matter around them. As it turned out, that's not the case.
After studying some 1,500 galaxies, researchers led by Alfred Tiley of Durham University found that the amount of dark matter surrounding these huge collections of stars and planets was roughly the same as ever.
Detecting dark matter around the galaxy can be awkward, but it is made easier by calculating the gravitational effect that matter has on the environment. We can not see the dark matter in the universe because it does not reflect light, but still has gravitational attraction, just like "normal" matter. Calculating the size of the galaxy and the speed of star movement at its edges, scientists can calculate how much the dark matter lurks at the edges.
This last round of research has applied the same formula to hundreds of galaxies, both young and old. Scientists now believe that there is not much difference between the amount of dark matter around the ancient galaxies compared to the much younger.
However, as Live Science reports, the astronomical community is not fully involved in this new finding. The model used by Tiley and his team is being questioned, especially regarding the measurements of remote galaxy galaxies studied by others looking for dark matter.
We will have to wait and see how this is going on, but the results are certainly interesting and will undoubtedly deepen the discussion of where the space darkness lays.