The invisible scaffolding that holds our entire universe together
In short: Everything we see—from the stars to your own shoes—accounts for only about 5% of the cosmos. The rest is a vast, invisible mystery. Scientists are finally using new technology to map the ghostly material that shapes everything from galaxies to planets.
For nearly a century, astronomers have been haunted by 'missing matter.' In 1933, Fritz Zwicky observed the Coma Cluster and noticed something strange: galaxies were moving far too quickly. Based on the visible matter present, these galaxies should have flown apart, yet they remained bound together. Zwicky proposed an invisible substance, which he called 'dunkle Materie,' was providing the extra gravity needed to hold them in place. This discrepancy suggested that an unseen force was acting upon the cluster. This concept of missing matter has been a central focus for researchers since the 1930s.
Today, we know this 'dark matter' is not just a fringe theory but a fundamental component of the cosmos. While it does not emit, reflect, or absorb light, it possesses mass and exerts gravitational influence. Present calculations indicate that regular matter constitutes roughly 5% of the cosmos, whereas dark matter comprises nearly 27%. The remaining portion is believed to be dark energy, another profound mystery. This dark matter interacts with the universe primarily through gravity. It does not interact with any part of the electromagnetic spectrum.
We are entering a new era of discovery thanks to the James Webb Space Telescope. Using its unprecedented sensitivity, scientists have produced a high-resolution map of dark matter in the constellation Sextans—an area 2.5 times larger than the full Moon. This map is twice as sharp as those from previous observatories, revealing how dark matter and regular matter have 'grown up together,' intertwining to form the cosmic structures we observe today. This imagery shows how the invisible material overlaps with the stuff that makes up stars and galaxies. It acts as a cosmic glue for the largest structures in existence.
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Sources
- Summary by Intellect · source: Chanda Prescod-Weinstein: The search for the invisible matter that shapes the universe
- Also: NASA Reveals New Details About Dark Matter’s Influence on Universe - NASA
- Also: Dark Matter - NASA Science
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