You have put a lot of effort on this article but some lines or phrases are either too unspecific or downright incorrect.
One such example could be
"A Black Hole is a dead star whose mass is more than three times the mass of sun. Such a star curves the space so much that it forms an infinitely deep hole in space."
this definition is too unspecific it could very well be perceived as incorrect.
And fellow steemers have already pointed out the operating idea behind GPS.
But upvoted for your effort.