A recent discovery has had astronomers going nuts: the discovery of countless dark galaxies. The discovery of one dark galaxy was alone mysterious, but when many different ones sprout up, it raised a lot of questions among the scientific community. However, the main question still to be confirmed is of a certain cosmic mystery: why are many galaxies dark?
But it wasn’t a matter of these dark galaxies sprouting up; as scientists have come to figure, they were already there before. The reason as to why they remained hidden for many years was because of the ghost light the cameras in space usually pick up, while taking photographs of galaxies hundreds of light years away. This necessitated new designs to factor the ghost light reflected by camera lenses.
The dragonfly picked up the first dark galaxy among other galaxy clusters (Coma). After a few observations along the edges of Coma, other dark galaxies were discovered. The surprising thing was that they were huge galaxies, too big enough for them not to have formed many stars in the beginning.
Speculations surrounding the phenomena of dark galaxies has been mostly attributed to a tremendous amount of dark matter within the galaxies themselves. That should explain why they have been able to exist amongst other bigger galaxies with strong gravitational forces; otherwise, they would have been pulled apart and ceased to exist.
Dark matter is an untraceable gravitational anomaly that only reveals itself via such gravitational interactions. The amount of dark matter that is speculated to exist within dark galaxies is, however, of greater intensity than normal. In fact, calculations have revealed that the dark matter presumably to have kept the dark galaxies intact would have to make up about 98% of their core regions, 13% higher than the average.
In addition, scientists partly accept that the environment in which dark galaxies exist also has a part to play as far as the cosmic mystery is concerned. Large galaxy clusters such as Coma, usually attract other galaxies towards them in time. As this happens, a phenomena known as a headwind strips gas, which is responsible for the formation of stars, away from some of the galaxies, thereby keeping the galaxy in the dark.
Other speculations exist in an attempt to explain the cosmic mystery: why are many galaxies dark? Some scientists say that there might be some obscure features responsible for making a galaxy dark. Regardless of that, investigation and further research are still underway in an attempt to understand dark galaxies more.