can someone explain me the concept of time, like I know that black holes can distort time, but how?
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You live in a 4 dimensional universe. Three dimensions are distance (spatial) and one is time (temporal). The speed of light (C) is the ratio of the distance in the temporal one, the one we call time, to the distance in the spacial ones, which we call distance. Every object exists as a unit velocity segment in this 4-space. Since a 4-space is hard to think about, let’s simplify (ELI5!) by considering the spatial dimensions in terms of our motion. Now we only have one spatial dimension, the direction we are moving. Turning (for the time being) doesn’t count. Next we graph our 2-space universe, with time on the vertical and distance on the horizontal. Every object is one unit from the origin on this graph, a quarter-circle. If a segment is aligned with the time direction (it’s vertical), the object’s spatial dimensions must be 0, this gives 0 speed in space and 1 second per second in time. If the velocity segment is oriented along the spacial dimension (horizontal) the object is moving at C, and since all segments are one unit long, it must be 0 in the temporal dimension. Thus photons move at the speed of light but do not experience changes in time. Gravity and other forces use energy to change the orientation of an object’s velocity segment, accelerating it in space and shortening the time element or decelerating it in space and lengthening the time segment.
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