In this blog, we will discuss about how can we see the past through black hole and here we are not discussing the past like our birth or shorter events but we will discuss about how can we see events like lighten the fire for the first time, abolition of dinosaurs, creation of our solar system or even the time of big bang. but there are 2 major question 1) can we ever go near or inside of black hole? 2) will we really be able to see the past within the black hole? For now, I will skip the first question and discuss the second, but before the discussion of how can we see the past, we must understand the basic concept of 'how we see an object'. Explanation: In the presence of light, the light waves reflected off from the object reach to our eyes and form an image of that object on the light-sensitive retina at the back of our eyes. The signals are sent to our brain through the optic nerve, and our brain deciphers the informat...