The light approaching us from the distance galaxies can be distorted because it is coming behind the massive objects. Those powerful gravitational field can bend the part of the light and kiss phenomena. It's called the gravitational lensing. To understand it, you just need a glass of water. Put the source of light behind the glass of water and whatever the light is coming from the source must have to travel through the glass and you can see the multiple images of the source because glass restores the part of the light and it is what happening in the gravitational lensing.