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But since dark matter cannot be detected by any means presently at our disposal, finding how the substance is distributed throughout the universe is tricky.
Scientists have to instead rely on the gravitational effects dark matter has on the things we can detect – galaxies.
Donghui Jeong, the study’s corresponding author and an associate professor of astronomy and astrophysics at Pennsylvania State University, said: “Ironically, it’s easier to study the distribution of dark matter much further away because it reflects the very distant past, which is much less complex.
“Over time, as the large-scale structure of the universe has grown, the complexity of the universe has increased, so it is inherently harder to make measurements about dark matter locally.”
The scientists published their findings this week in The Astrophysical Journal.
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