Today I found an article in a scientific journal that talks about the relation between the dark matter and gravitational lenses.
As you recall, some time ago you talk that was a gravitational lens, though, just in case, do what I will remember as a summary.
A gravitational lens is a large accumulation of material which by its gravity causes light to bend it crosses so that, at a distance, objects that are around or even behind deformed.
Gravitational lensing is a much more common than you think in our galaxy phenomenon. In fact, our sun acts as such distorting the light of the stars located behind and looking in two places at once, as you can see in the picture. These distorted images, therefore, are quite common in our universe.
However, this behavior can also help us to date the distance of an object. As Einstein predicted, with his equations distortion in space time his theory of general relativity we can calculate with great precision the distance knowing that performs mass distortion.
In the picture, taken in 2014 by the Atacama Large Millimeter / submillimeter Array (ALMA) in Chile quirk, we have a galaxy located two billion light years where also it is important to know that is what generates this aberration. In this case it is thought to be a “dark galaxy”, so called because it is believed to be an accumulation of being an invisible dark matter galaxy.
That is, many of gravitational lensing have been observed focus on the product that makes this “lens” must be massive. The important thing is that nothing that is the cause of this aberration with what we are two possible subjects observed: either a black hole or dark matter.
If a black hole around would have more material it would be gulping it would look like a hot zone spinning rapidly, but if that element is not observed (or infrared) the only solution left is something massive unseen, dark matter.
The important of gravitational lenses made of dark matter is that we can assert equations to compare with what we see mode to perform and refine our models of dark matter and understand why this matter is 85% of our universe.