Dark matter continues to mystify astrophysicists as a new galaxy, 65 million light-years away, filled with stars, but with no “apparent” dark matter has been discovered.
Making up more than 85% of the matter in the observable universe, dark matter is still a no-show in every scientific experiment that aimed to detect it.
CERN’s Large Hadron Collider and other detection facilities have also failed to spot the ghost particle of dark matter.
The Hunt for Dark Matter
With its observable effects on the cosmic scale, scientists think that dark matter’s “elusiveness” boils down to a particle that has weak interaction. This weakness to interact makes it difficult to directly detect the particle.
Based upon speculation that this particle exists, several dark matter detectors have been built around the world.
For example, the XENON Experiment operates the most sensitive DM detector at the Laboratori Nazionali del Gran Sasso in Italy.
The detector (XENON1T), which is put underground to shield it from radiation, looks for WIMPs (Weakly Interacting Massive Particles). WIMPS are one of the prime candidates for dark matter.
XENONIT ran a 30-day test and, though the elusive WIMPs didn’t “show up”, scientists are confident that this was still “the best result on dark matter so far”.
Always in Italy, DAMA (for DArk MAtter) is a project focused on dark matter research.
One of DAMA’s several experiments is the DAMA/LIBRA project (Large sodium Iodide Bulk for RAre processes) which has been working for the last two decades to find direct evidence that proves dark matter exists.
Recently, DAMA researchers claimed they have managed to trap the sought-after dark matter particle.
Where’s all the Dark Matter?
Dark matter is supposed to be the mysterious force that keeps galaxies together in their globular clusters.
However, an international research team announced that they observed, for the first time, a ghostly galaxy that looks to be totally devoid of dark matter.
Data about the galaxy named NGC 1052-DF2 suggest that it has 1/400th the expected amount of dark matter.
“We thought that every galaxy had dark matter and that dark matter is how a galaxy begins,” said the lead researcher. “This invisible, mysterious substance is the most dominant aspect of any galaxy. So finding a galaxy without it is unexpected. It challenges the standard ideas of how we think galaxies work, and it shows that dark matter is real: it has its own separate existence apart from other components of galaxies. This result also suggests that there may be more than one way to form a galaxy.”
Researchers took evidence from four telescopes at different stages to come to their conclusions: the Dragonfly Telephoto Array (New Mexico), the W.M. Keck Observatory (Hawaii), NASA’s Hubble Space Telescope, and the Gemini Observatory (Hawaii).
In a stark contrast to the missing dark matter news, two years ago, astronomers have discovered Dragonfly 44, a massive galaxy that’s mostly (99.99%) dark matter.
Although a concept still theoretical, from lack of a direct evidence of its existence, dark matter is an essential element in physics without which our understanding of the formation and evolution of the universe wouldn’t hold.