Of coarse, no one can calculate its exact size, especially if one believes that it's as large as time is forever. What drives my curiosity, are the pure facts of physical science. . . O ne is the fact that the universe is just too large to be measured in the conventional sense, so now, distances are measured in light years. That alone is hard to fattom. That alone, staggers the imagination.
Earth is two thirds of a millionth of a light year from the sun.
The nearest star, Proxima Centaur , is 4.2 light years away and then the red giant star Aldebaran at 60 light years. Its diameter is 40 times that of our sun. Kinda puts a whole new perspective on how long it will take to go to grandma's house. For as long as humans have looked up to the stars, they have asked what they could be and how far away they are. Some said stars were the camp fires of distant tribes.