Gravitational lensing is the natural phenomena that occurs due to the bending of light around the massive object that distorted the spacetime.
This phenomena helped us to think about the presence of some hidden mass which was further called as Dark Matter. It is predicted that about twenty three percent of our Universe comprises the dark matter. This is completely different from the ordinary matter that we perceive in our daily life. It is present in our universe but is still not seen. We know that gravitational lensing phenomena occurs only when there is a massive object present in between the light source and the observer.
Existence of dark matter --
Lets assume that a light ray of star before coming to us, has to come near a massive galaxy. This massive object acts as a lens which changes the direction of upcoming light in every possible direction that enables us to see the multiple images or the distorted- magnified images of that source.
Now on knowing the data of received light, we can calculate the mass of the galaxy cluster using computer simulation. As we know how the gravity works, we produce the same gravitational lensing effect in computer by providing all the data of received light and the observed mass of galaxy which acts as a lens. We then tried to figure out that if we are getting the same bending of light what we have got experimentally or not. On contrary, we found that the observed mass of that galaxy was not capable to bend the light to the same extent that was observed in real situation. In fact it was found that to produce same gravitational lensing effect through computer simulation, it needs ten times the mass of the actual mass of the galaxy. It was then assumed that there is some thing which is invisible but have mass. This invisible mass along with the galaxy, is responsible for the actual bending of light to that extent. From further study, it was suggested that this missing mass is distributed throughout the universe. This invisible and missing mass was named as Dark matter.
It does not interact with the light and so we can not see it. Dark matter is still a mystery and a matter of curiosity among the science lovers.
This phenomena helped us to think about the presence of some hidden mass which was further called as Dark Matter. It is predicted that about twenty three percent of our Universe comprises the dark matter. This is completely different from the ordinary matter that we perceive in our daily life. It is present in our universe but is still not seen. We know that gravitational lensing phenomena occurs only when there is a massive object present in between the light source and the observer.
Existence of dark matter --
Lets assume that a light ray of star before coming to us, has to come near a massive galaxy. This massive object acts as a lens which changes the direction of upcoming light in every possible direction that enables us to see the multiple images or the distorted- magnified images of that source.
Now on knowing the data of received light, we can calculate the mass of the galaxy cluster using computer simulation. As we know how the gravity works, we produce the same gravitational lensing effect in computer by providing all the data of received light and the observed mass of galaxy which acts as a lens. We then tried to figure out that if we are getting the same bending of light what we have got experimentally or not. On contrary, we found that the observed mass of that galaxy was not capable to bend the light to the same extent that was observed in real situation. In fact it was found that to produce same gravitational lensing effect through computer simulation, it needs ten times the mass of the actual mass of the galaxy. It was then assumed that there is some thing which is invisible but have mass. This invisible mass along with the galaxy, is responsible for the actual bending of light to that extent. From further study, it was suggested that this missing mass is distributed throughout the universe. This invisible and missing mass was named as Dark matter.
It does not interact with the light and so we can not see it. Dark matter is still a mystery and a matter of curiosity among the science lovers.
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