Albert Einstein realized that in addition to the 3 dimensions (length, height, and width) there was a 4th dimension: time.  This became known as 4 dimensional space-time.  To visualize this, you use fabric.  Now when an object is placed on the fabric, it bends, and if you put another object on it, it will roll toward that object.  This is gravity.  Here’s a helpful video.

Now a black hole bends the fabric so much, it tears, as shown in this picture ————————–—————–> THAT is how powerful a black hole is, being able to rip the fabric of the universe.